Number of children (weighted percentage) with KS1 missing according to selected factors, overall and by gestational age in the Millennium Cohort Study children in England
| Variable | Characteristic | Total (n=7842) (%) | Very/moderately preterm (<34 weeks) n=183 (%) | Late preterm (34–36 weeks) n=469 (%) | Early term (37–38 weeks) n=1632 (%) | Full term (39–41 weeks) n=5558 (%) |
|---|---|---|---|---|---|---|
| Missing KS1 results (%) | 1811 (22) | 47 (24) | 109 (23) | 374 (23) | 1281 (22) | |
| Maternal birth country | UK | 1206 (20) | 35 (22) | 78 (21) | 246 (20) | 847 (19) |
| Education level/qualification | Higher: tertiary (NVQ 4/5) | 630 (25) | 19 (30) | 24 (18) | 122 (26) | 465 (25) |
| Medium: high school (NVQ 3) | 229 (21) | 5 (34) | 14 (20) | 51 (25) | 159 (20) | |
| Lower: left 16 years (NVQ 1/2) | 535 (18) | 15 (19) | 43 (20) | 121 (19) | 356 (17) | |
| No formal/other | 415 (29) | 8 (19) | 28 (42) | 80 (26) | 299 (30) | |
| Social class | High: manager/professional | 546 (24) | 15 (29) | 23 (18) | 105 (25) | 403 (25) |
| Intermediate | 317 (19) | 9 (22) | 17 (17) | 74 (21) | 217 (19) | |
| Low: routine/semi routine | 617 (20) | 9 (12) | 48 (27) | 136 (22) | 424 (19) | |
| Never worked | 331 (33) | 14 (61) | 21 (34) | 59 (27) | 237 (34) | |
| Ethnicity | White | 1147 (20) | 31 (22) | 74 (22) | 239 (21) | 803 (19) |
| Non-white | 662 (36) | 16 (32) | 35 (28) | 135 (31) | 476 (39) | |
| Health rating parental report | Excellent | 1005 (21) | 26 (30) | 48 (19) | 219 (22) | 712 (21) |
| Very good | 504 (23) | 11 (19) | 39 (26) | 91 (23) | 363 (22) | |
| Good | 203 (24) | 6 (16) | 13 (26) | 40 (22) | 144 (25) | |
| Fair or poor | 63 (23) | 2 (8) | 7 (29) | 14 (21) | 40 (24) | |
| Longstanding limiting illness | 140 (26) | 7 (23) | 11 (27) | 29 (27) | 93 (26) | |
| 3+ hospital admissions | 77 (17) | 7 (14) | 9 (22) | 11 (10) | 50 (19) | |
All percentages are weighted. KS1, Key Stage 1; NVQ, National Vocational Qualification.