Table 1

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

VariableCharacteristicTotal
(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 countryUK1206 (20)35 (22)78 (21)246 (20)847 (19)
Education level/qualificationHigher: 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/other415 (29)8 (19)28 (42)80 (26)299 (30)
Social classHigh: manager/professional546 (24)15 (29)23 (18)105 (25)403 (25)
Intermediate317 (19)9 (22)17 (17)74 (21)217 (19)
Low: routine/semi routine617 (20)9 (12)48 (27)136 (22)424 (19)
Never worked331 (33)14 (61)21 (34)59 (27)237 (34)
EthnicityWhite1147 (20)31 (22)74 (22)239 (21)803 (19)
Non-white662 (36)16 (32)35 (28)135 (31)476 (39)
Health rating parental reportExcellent1005 (21)26 (30)48 (19)219 (22)712 (21)
Very good504 (23)11 (19)39 (26)91 (23)363 (22)
Good203 (24)6 (16)13 (26)40 (22)144 (25)
Fair or poor63 (23)2 (8)7 (29)14 (21)40 (24)
Longstanding limiting illness140 (26)7 (23)11 (27)29 (27)93 (26)
3+ hospital admissions77 (17)7 (14)9 (22)11 (10)50 (19)
  • All percentages are weighted. KS1, Key Stage 1; NVQ, National Vocational Qualification.