| pidp | Cross-wave person identifier (numeric) |
| ks1_msch | Maintained school (including CTCs and Academies) |
| ks1_msch2 | Maintained school (excluding CTCs and Academies) |
| ks1_mob1 | Pupil joined in latest academic year (year 2) |
| ks1_mob2 | Pupil joined in previous academic year (year 1) |
| ks1_speakandlisten | NC level awarded for speaking and listening (TA) |
| ks1_engreadtsk | English Reading Task |
| ks1_engcomptst | English comprehension test |
| ks1_reading | NC level awarded for reading (TA) |
| ks1_engwrittst | English writing test |
| ks1_engspelltst | English spelling test |
| ks1_acadyr | Academic year |
| ks1_writing | NC level awarded for writing (TA) |
| ks1_readwrit | English Average Level (derived from Reading and Writing) |
| ks1_engsubta | Overall English TA level |
| ks1_mathuseapp | Maths using and applying (TA) |
| ks1_mathnoalg | Maths number and algebra (TA) |
| ks1_matshapmeas | Maths shapes and measures (TA) |
| ks1_mathtsktst | Maths tasks/tests |
| ks1_maths | NC level awarded for maths (TA) |
| ks1_sciexpinvest | NC level awarded for scientific enquiry (TA) |
| ks1_scilifprot | NC level awarded for life and living processes (TA) |
| ks1_la_9code | Local authority 9-digit code |
| ks1_scimatprop | NC level awarded for materials and their properties (TA) |
| ks1_sciphysproc | NC level awarded for physical processes (TA) |
| ks1_science | NC level awarded for overall science (TA) |
| ks1_read_outcome | Reading outcome |
| ks1_writ_outcome | Writing outcome |
| ks1_math_outcome | Mathematics outcome |
| ks1_sci_outcome | Science outcome |
| ks1_readpoints | Reading attainment point score |
| ks1_writpoints | Writing attainment point score |
| ks1_readwritpoints | Average reading and writing attainment point score |
| ks1_laestab | The LA and ESTAB fields joined |
| ks1_matpoints | Maths attainment point score |
| ks1_scipoints | Overall Science attainment point score |
| ks1_aps | Average attainment point score (including Reading, Writing, Maths and Overall Sc |
| ks1_apsrwm | Average attainment point score (including Reading, Writing and Maths only) |
| ks1_urn | Unique establishment number or early learner provider number |
| ks1_toe_code | Type of establishment code taken from Edubase |
| ks1_nftype | Institution type |
| ks1_mmsch | Maintained mainstream school (including CTCs and Academies) |
| ks1_mmsch2 | Maintained mainstream school (excluding CTCs and Academies) |