Home > Data and documentation > Main Survey > Variables

Mainstage Variable

pregsmk21

pregnancy 1: No. of cigarettes smoked during second trimester

Datafile

indresp

Index term

Fertility

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	35326	99.59%
proxy	-7	134	0.38%
[Value >= 0]	1	11	0.03%
	Total	35471	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
5.45	35460	2.0	10.0	2.73	11

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	27888	99.61%
proxy	-7	104	0.37%
[Value >= 0]	1	6	0.02%
	Total	27998	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
7.0	27992	2.0	20.0	7.04	6

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	29065	99.3%
proxy	-7	198	0.68%
[Value >= 0]	1	8	0.03%
	Total	29271	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
5.88	29263	1.0	15.0	4.67	8

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	31524	98.49%
proxy	-7	464	1.45%
[Value >= 0]	1	20	0.06%
	Total	32008	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
7.6	31988	2.0	20.0	4.94	20

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	33500	97.61%
proxy	-7	804	2.34%
[Value >= 0]	1	15	0.04%
	Total	34319	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
8.07	34304	1.0	30.0	8.3	15

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	34940	96.9%
proxy	-7	1096	3.04%
[Value >= 0]	1	22	0.06%
	Total	36058	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
6.18	36036	1.0	20.0	4.93	22

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	37587	95.66%
proxy	-7	1683	4.28%
don't know	-1	1	0.0%
[Value >= 0]	1	23	0.06%
	Total	39294	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
9.0	39271	1.0	25.0	7.17	23

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	39294	93.18%
proxy	-7	2832	6.72%
don't know	-1	2	0.0%
[Value >= 0]	1	42	0.1%
	Total	42170	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
7.36	42128	1.0	20.0	5.62	42

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	37415	82.79%
proxy	-7	3129	6.92%
[Value >= 0]	1	4648	10.29%
	Total	45192	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
-9.86	40544	-10.0	20.0	1.68	4648

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	40918	91.26%
proxy	-7	3858	8.6%
[Value >= 0]	1	61	0.14%
	Total	44837	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
8.0	44776	1.0	40.0	6.12	61

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	43066	91.49%
proxy	-7	3935	8.36%
don't know	-1	1	0.0%
[Value >= 0]	1	72	0.15%
	Total	47074	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
9.36	47002	1.0	40.0	6.62	72

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	45758	92.08%
proxy	-7	3830	7.71%
[Value >= 0]	1	104	0.21%
	Total	49692	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
8.21	49588	1.0	20.0	5.39	104

Value label	Value	Absolute frequency	Relative frequency
inapplicable	-8	50593	92.72%
proxy	-7	3880	7.11%
[Value >= 0]	1	95	0.17%
	Total	54568	100.0%

Mean	Number Missing	Min	Max	Std Dev	N
8.37	54473	1.0	30.0	6.06	95

Code creator
0

Create your own Stata code to extract data from the main end user licence Understanding Society dataset. Find out more

Saved variables

What else is Understanding Society doing?

Photo of family walking their dog in the countryside

Children’s worries include good grades and rising prices

Children’s average happiness is lower across six aspects of life in 2022/23 compared to 2009/10

Photo of calendar showing the year 2023

Calendar Year 2023 data now available

The latest release of our Calendar Year datasets can now be accessed via the UK Data Service.

Deputy Director of Understanding Society

Professor Annette Jäckle debates survey methods on BBC Radio 4

The Deputy Director of Understanding Society, Professor Annette Jäckle, has featured on a BBC Radio 4 programme to unpick the reality behind a recent headline about young people.

A group of teenage friends, laughing

Young people’s aspirations rise with parents’ income

Our capacity to plan for the future shapes our lives, and is affected by family wealth.

Email newsletter

Sign up to our newsletter

ESRC Institute for Social and Economic Research University of Essex

The Economic and Social Research Council is the primary funder of the study
The Study is led by a team at the Institute for Social and Economic Research (ISER) at the University of Essex.