# birthm

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dob month

Special licence version only

### Datafiles

**indall**, **xwavedat**, **xwaveid**, **indresp**, **child**, **xwaveid_bh**

### Derived Variable Note

Month of birth. Special Licence release (SN6931) only.

See DOBM_DV DOBY_DV

### Index term

**Socio-demographic Characteristics**

### Related question

#### hhgrid_w9.birthm

DOB month**Text:**

(What is [your]/[NAME]'s/[ff_forname]'s date of birth?)

**Universe:**

if BirthChk = 2 | NewPer = 1 | NewPer = 3 (DOB check is incorrect or individual is a new household member or is a rejoiner not found in the data)

### Wave specific data

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.41 | 28 | 1.0 | 12.0 | 3.44 | 36027 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.41 | 39 | 1.0 | 12.0 | 3.44 | 39254 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.42 | 62 | 1.0 | 12.0 | 3.43 | 42106 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.4 | 372 | 1.0 | 12.0 | 3.44 | 44816 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.39 | 34 | 1.0 | 12.0 | 3.43 | 44799 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.4 | 48 | 1.0 | 12.0 | 3.43 | 47023 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.4 | 50 | 1.0 | 12.0 | 3.43 | 49642 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.39 | 98 | 1.0 | 12.0 | 3.43 | 54471 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.39 | 418 | 1.0 | 12.0 | 3.44 | 50576 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.42 | 2 | 1.0 | 12.0 | 3.43 | 14417 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 1 | 1.0 | 12.0 | 3.42 | 14872 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.46 | 3 | 1.0 | 12.0 | 3.43 | 15389 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.46 | 3 | 1.0 | 12.0 | 3.43 | 15614 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.46 | 1 | 1.0 | 12.0 | 3.43 | 15790 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 3 | 1.0 | 12.0 | 3.42 | 16235 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.41 | 3 | 1.0 | 12.0 | 3.42 | 16594 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.43 | 3 | 1.0 | 12.0 | 3.41 | 18864 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 1 | 1.0 | 12.0 | 3.42 | 15602 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 4 | 1.0 | 12.0 | 3.42 | 15619 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 1 | 1.0 | 12.0 | 3.41 | 10905 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 3 | 1.0 | 12.0 | 3.4 | 11190 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 3 | 1.0 | 12.0 | 3.41 | 9435 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.48 | 6 | 1.0 | 12.0 | 3.41 | 9243 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 6 | 1.0 | 12.0 | 3.42 | 9475 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 5 | 1.0 | 12.0 | 3.42 | 9595 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 5 | 1.0 | 12.0 | 3.41 | 9840 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 124 | 1.0 | 12.0 | 3.43 | 52567 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 186 | 1.0 | 12.0 | 3.44 | 56419 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 312 | 1.0 | 12.0 | 3.44 | 59626 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 1133 | 1.0 | 12.0 | 3.45 | 63573 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.43 | 208 | 1.0 | 12.0 | 3.43 | 61300 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.43 | 241 | 1.0 | 12.0 | 3.44 | 65385 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.43 | 257 | 1.0 | 12.0 | 3.44 | 70414 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.42 | 523 | 1.0 | 12.0 | 3.44 | 76973 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.42 | 1573 | 1.0 | 12.0 | 3.44 | 75736 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.43 | 131 | 1.0 | 12.0 | 3.42 | 20046 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 114 | 1.0 | 12.0 | 3.42 | 20601 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 132 | 1.0 | 12.0 | 3.42 | 21257 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 84 | 1.0 | 12.0 | 3.42 | 21646 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 2 | 0.01% |

don't know | -1 | 92 | 0.42% |

January | 1 | 1868 | 8.44% |

February | 2 | 1708 | 7.72% |

March | 3 | 1952 | 8.82% |

April | 4 | 1885 | 8.52% |

May | 5 | 1902 | 8.6% |

June | 6 | 1856 | 8.39% |

July | 7 | 1820 | 8.23% |

August | 8 | 1910 | 8.63% |

September | 9 | 1859 | 8.4% |

October | 10 | 1803 | 8.15% |

November | 11 | 1704 | 7.7% |

December | 12 | 1766 | 7.98% |

Total | 22127 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 94 | 1.0 | 12.0 | 3.42 | 22033 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 1 | 0.0% |

don't know | -1 | 87 | 0.39% |

January | 1 | 1906 | 8.44% |

February | 2 | 1748 | 7.74% |

March | 3 | 2000 | 8.86% |

April | 4 | 1948 | 8.63% |

May | 5 | 1934 | 8.57% |

June | 6 | 1901 | 8.42% |

July | 7 | 1853 | 8.21% |

August | 8 | 1942 | 8.6% |

September | 9 | 1890 | 8.37% |

October | 10 | 1824 | 8.08% |

November | 11 | 1728 | 7.65% |

December | 12 | 1812 | 8.03% |

Total | 22574 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 88 | 1.0 | 12.0 | 3.42 | 22486 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 1 | 0.0% |

don't know | -1 | 117 | 0.5% |

January | 1 | 1996 | 8.52% |

February | 2 | 1801 | 7.69% |

March | 3 | 2096 | 8.94% |

April | 4 | 2031 | 8.67% |

May | 5 | 2026 | 8.65% |

June | 6 | 1969 | 8.4% |

July | 7 | 1926 | 8.22% |

August | 8 | 2000 | 8.53% |

September | 9 | 1974 | 8.42% |

October | 10 | 1878 | 8.01% |

November | 11 | 1746 | 7.45% |

December | 12 | 1874 | 8.0% |

Total | 23435 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.42 | 118 | 1.0 | 12.0 | 3.42 | 23317 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 3 | 0.01% |

don't know | -1 | 112 | 0.42% |

January | 1 | 2246 | 8.45% |

February | 2 | 2061 | 7.75% |

March | 3 | 2400 | 9.03% |

April | 4 | 2315 | 8.71% |

May | 5 | 2280 | 8.58% |

June | 6 | 2213 | 8.32% |

July | 7 | 2211 | 8.32% |

August | 8 | 2286 | 8.6% |

September | 9 | 2218 | 8.34% |

October | 10 | 2123 | 7.99% |

November | 11 | 1988 | 7.48% |

December | 12 | 2130 | 8.01% |

Total | 26586 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.42 | 115 | 1.0 | 12.0 | 3.42 | 26471 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 5 | 0.02% |

don't know | -1 | 110 | 0.51% |

January | 1 | 1800 | 8.33% |

February | 2 | 1682 | 7.79% |

March | 3 | 1960 | 9.07% |

April | 4 | 1837 | 8.5% |

May | 5 | 1818 | 8.42% |

June | 6 | 1790 | 8.29% |

July | 7 | 1818 | 8.42% |

August | 8 | 1846 | 8.55% |

September | 9 | 1842 | 8.53% |

October | 10 | 1765 | 8.17% |

November | 11 | 1584 | 7.33% |

December | 12 | 1745 | 8.08% |

Total | 21602 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 115 | 1.0 | 12.0 | 3.42 | 21487 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 5 | 0.02% |

don't know | -1 | 129 | 0.6% |

January | 1 | 1803 | 8.36% |

February | 2 | 1682 | 7.8% |

March | 3 | 1938 | 8.99% |

April | 4 | 1854 | 8.6% |

May | 5 | 1830 | 8.49% |

June | 6 | 1764 | 8.18% |

July | 7 | 1812 | 8.4% |

August | 8 | 1833 | 8.5% |

September | 9 | 1810 | 8.39% |

October | 10 | 1752 | 8.12% |

November | 11 | 1600 | 7.42% |

December | 12 | 1754 | 8.13% |

Total | 21566 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 134 | 1.0 | 12.0 | 3.42 | 21432 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 3 | 0.02% |

don't know | -1 | 52 | 0.35% |

January | 1 | 1199 | 8.08% |

February | 2 | 1156 | 7.79% |

March | 3 | 1388 | 9.36% |

April | 4 | 1275 | 8.59% |

May | 5 | 1279 | 8.62% |

June | 6 | 1205 | 8.12% |

July | 7 | 1262 | 8.51% |

August | 8 | 1264 | 8.52% |

September | 9 | 1236 | 8.33% |

October | 10 | 1199 | 8.08% |

November | 11 | 1107 | 7.46% |

December | 12 | 1210 | 8.16% |

Total | 14835 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 55 | 1.0 | 12.0 | 3.42 | 14780 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 1 | 0.01% |

don't know | -1 | 49 | 0.33% |

January | 1 | 1209 | 8.04% |

February | 2 | 1177 | 7.82% |

March | 3 | 1408 | 9.36% |

April | 4 | 1296 | 8.62% |

May | 5 | 1271 | 8.45% |

June | 6 | 1243 | 8.26% |

July | 7 | 1267 | 8.42% |

August | 8 | 1279 | 8.5% |

September | 9 | 1266 | 8.42% |

October | 10 | 1241 | 8.25% |

November | 11 | 1127 | 7.49% |

December | 12 | 1208 | 8.03% |

Total | 15042 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 50 | 1.0 | 12.0 | 3.41 | 14992 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 1 | 0.01% |

don't know | -1 | 52 | 0.41% |

January | 1 | 1028 | 8.08% |

February | 2 | 1002 | 7.88% |

March | 3 | 1208 | 9.5% |

April | 4 | 1064 | 8.36% |

May | 5 | 1083 | 8.51% |

June | 6 | 1061 | 8.34% |

July | 7 | 1066 | 8.38% |

August | 8 | 1056 | 8.3% |

September | 9 | 1077 | 8.47% |

October | 10 | 1047 | 8.23% |

November | 11 | 969 | 7.62% |

December | 12 | 1006 | 7.91% |

Total | 12720 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.43 | 53 | 1.0 | 12.0 | 3.42 | 12667 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 10 | 0.08% |

don't know | -1 | 51 | 0.41% |

January | 1 | 1000 | 7.97% |

February | 2 | 991 | 7.9% |

March | 3 | 1191 | 9.49% |

April | 4 | 1040 | 8.29% |

May | 5 | 1070 | 8.53% |

June | 6 | 1037 | 8.26% |

July | 7 | 1039 | 8.28% |

August | 8 | 1040 | 8.29% |

September | 9 | 1076 | 8.57% |

October | 10 | 1048 | 8.35% |

November | 11 | 956 | 7.62% |

December | 12 | 1000 | 7.97% |

Total | 12549 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 61 | 1.0 | 12.0 | 3.42 | 12488 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 6 | 0.05% |

don't know | -1 | 39 | 0.3% |

January | 1 | 1048 | 8.16% |

February | 2 | 1014 | 7.89% |

March | 3 | 1218 | 9.48% |

April | 4 | 1083 | 8.43% |

May | 5 | 1088 | 8.47% |

June | 6 | 1051 | 8.18% |

July | 7 | 1066 | 8.3% |

August | 8 | 1057 | 8.23% |

September | 9 | 1108 | 8.62% |

October | 10 | 1056 | 8.22% |

November | 11 | 992 | 7.72% |

December | 12 | 1025 | 7.98% |

Total | 12851 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 45 | 1.0 | 12.0 | 3.42 | 12806 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 6 | 0.05% |

don't know | -1 | 56 | 0.43% |

January | 1 | 1051 | 8.02% |

February | 2 | 1026 | 7.83% |

March | 3 | 1226 | 9.36% |

April | 4 | 1136 | 8.67% |

May | 5 | 1097 | 8.37% |

June | 6 | 1065 | 8.13% |

July | 7 | 1078 | 8.23% |

August | 8 | 1089 | 8.31% |

September | 9 | 1148 | 8.76% |

October | 10 | 1065 | 8.13% |

November | 11 | 1017 | 7.76% |

December | 12 | 1044 | 7.97% |

Total | 13104 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 62 | 1.0 | 12.0 | 3.42 | 13042 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

refusal | -2 | 22 | 0.17% |

don't know | -1 | 26 | 0.2% |

January | 1 | 1056 | 8.03% |

February | 2 | 1013 | 7.7% |

March | 3 | 1232 | 9.37% |

April | 4 | 1144 | 8.7% |

May | 5 | 1116 | 8.49% |

June | 6 | 1072 | 8.15% |

July | 7 | 1118 | 8.5% |

August | 8 | 1089 | 8.28% |

September | 9 | 1136 | 8.64% |

October | 10 | 1069 | 8.13% |

November | 11 | 1023 | 7.78% |

December | 12 | 1035 | 7.87% |

Total | 13151 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 48 | 1.0 | 12.0 | 3.41 | 13103 |

#### Frequencies

Value label | Value | Absolute frequency | Relative frequency |
---|---|---|---|

missing | -9 | 4 | 0.03% |

refusal | -2 | 12 | 0.09% |

don't know | -1 | 48 | 0.35% |

January | 1 | 1126 | 8.14% |

February | 2 | 1062 | 7.67% |

March | 3 | 1291 | 9.33% |

April | 4 | 1194 | 8.63% |

May | 5 | 1171 | 8.46% |

June | 6 | 1128 | 8.15% |

July | 7 | 1166 | 8.42% |

August | 8 | 1150 | 8.31% |

September | 9 | 1213 | 8.76% |

October | 10 | 1108 | 8.01% |

November | 11 | 1089 | 7.87% |

December | 12 | 1078 | 7.79% |

Total | 13840 | 100.0% |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.45 | 64 | 1.0 | 12.0 | 3.41 | 13776 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.58 | 8 | 1.0 | 12.0 | 3.45 | 10298 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.59 | 39 | 1.0 | 12.0 | 3.45 | 11510 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.6 | 58 | 1.0 | 12.0 | 3.47 | 12509 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.59 | 185 | 1.0 | 12.0 | 3.47 | 12828 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.56 | 10 | 1.0 | 12.0 | 3.46 | 12886 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.56 | 25 | 1.0 | 12.0 | 3.45 | 14122 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.55 | 25 | 1.0 | 12.0 | 3.46 | 15498 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.56 | 74 | 1.0 | 12.0 | 3.46 | 17064 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.55 | 351 | 1.0 | 12.0 | 3.45 | 17476 |

#### Origin

Uses W_BIRTHM on data file W_INDALL

Uses BW_BIRTHM on data file BW_INDALL

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.46 | 1660 | 1.0 | 12.0 | 3.44 | 145427 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.44 | 979 | 1.0 | 12.0 | 3.42 | 42293 |

#### Statistics

Mean | Number Missing | Min | Max | Std Dev | N |
---|---|---|---|---|---|

6.46 | 776 | 1.0 | 12.0 | 3.44 | 123941 |