TABLE 1

Characteristics of schoolchildren by presence or not of treated asthma

No asthmaAsthmap-value
Subjects637 81645 900
Sociodemographic factors
 Sex
  Male318 360 (49.9)26 806 (58.4)<0.001
  Female319 456 (50.1)19 094 (41.6)
  Missing00
 Deprivation quintile
  1 (most deprived)141 585 (22.2)12 357 (26.9)<0.001
  2126 279 (19.8)9941 (21.7)
  3122 827 (19.3)8917 (19.4)
  4126 335 (19.8)7985 (17.4)
  5 (least deprived)120 288 (18.9)6667 (14.5)
  Missing50233
 Ethnic group
  White606 601 (96.3)43 388 (95.5)<0.001
  Asian14 222 (2.3)1364 (3.0)
  Black1634 (0.3)126 (0.3)
  Mixed5471 (0.9)439 (1.0)
  Other1732 (0.3)125 (0.3)
  Missing8156458
Maternity factors
 Maternal age years
  ≤24171 602 (26.9)13 868 (30.2)<0.001
  25–29187 171 (29.4)13 516 (29.5)
  30–34182 432 (28.6)12 209 (26.6)
  ≥3596 600 (15.2)6307 (13.7)
  Missing110
 Maternal smoking
  No411 276 (72.8)28 269 (69.2)<0.001
  Yes153 337 (27.2)12 595 (30.8)
  Missing73 2035036
 Parity
  0284 289 (44.8)21 760 (47.7)<0.001
  1221 459 (34.9)15 205 (33.3)
  >1128 980 (20.3)8673 (19.0)
  Missing3088262
 Mode of delivery
  Spontaneous vaginal delivery552 730 (67.8)29 750 (62.4)<0.001
  Assisted vaginal75 713 (11.9)5587 (2.4)
  Breech vaginal1825 (0.3)154 (12.2)
  Elective Caesarean section48 267 (7.7)3700 (0.3)
  Emergency Caesarean section79 325 (12.4)6700 (8.1)
  Other141 (0.0)9 (0.0)
  Missing20
 Gestation weeks
  <2417 (0.0)3 (0.0)<0.001
  24–27753 (0.1)178 (0.4)
  28–325338 (0.8)719 (1.6)
  33–3628 351 (4.5)2836 (6.2)
  3730 587 (4.8)2613 (5.7)
  3879 248 (12.4)6058 (13.2)
  39132 322 (20.8)9448 (20.6)
  40193 364 (30.3)13 103 (28.6)
  41143 715 (22.6)9451 (20.6)
  4222 979 (3.6)1416 (3.1)
  43542 (0.1)32 (0.1)
  >43120 (0.0)9 (0.0)
  Missing48034
 Sex-gestation-specific birthweight centile
  1–325 763 (4.0)2153 (4.7)<0.001
  4–1056 669 (8.9)4308 (9.4)
  11–2075 633 (11.9)5582 (12.2)
  21–80375 540 (59.0)26 539 (57.9)
  81–9054 540 (8.6)3758 (8.2)
  91–9734 407 (5.4)2490 (5.4)
  98–10014 266 (2.2)1000 (2.2)
  Missing81070
 5-min Apgar score
  1–33044 (0.5)264 (0.6)<0.001
  4–65864 (0.9)565 (1.2)
  7–10622 502 (98.6)44 568 (98.2)
  Missing6406503

Data are presented as n or n (%); percentages may not add up to 100 due to rounding.