Table 2

Demographics of the study population (Bold numbers show differences in this table compared with the original published journal article)

Asthma algorithm
No asthmaDiagnosis only or intermittent bronchodilatorPersistent mild*Persistent moderate or severeInpatient hospital admission†
N 75 870 2872 6298 1671 3513
Gestation at birth‡
≤32 1001 (1)73 (3) 183 (3)56 (3) 154 (4)
33–36 4010 (5) 177 (6) 393 (6)131 (8) 247 (7)
37+weeks66 473 (88) 2457 (86) 5379 (85) 1393 (83) 2933 (84)
Congenital anomaly§=Yes(%) 3552 (5)187 (7) 376 (6)115 (7) 274 (8)
Townsend deprivation quintile at birth
1 - least (%)13 853 (18) 426 (15) 922 (15) 220 (13) 462 (13)
2 (%)14 905 (20) 477 (17) 1112 (18) 307 (18) 598 (17)
3 (%)15 291 (20) 566 (20) 1257 (20) 341 (20) 683 (19)
4 (%)15 564 (21) 618 (22) 1421 (23) 393 (24) 829 (24)
5 - most (%)16 035 (21) 774 (27) 1565 (25) 404 (24) 927 (26)
Free school meals eligible¶=yes(%)12 469 (16) 652 (23) 1285 (20) 343 (21) 805 (23)
School absence percentage¶**
<5 (%)19 986 (48) 613 (41) 1261 (39) 298 (31) 627 (33)
5–9 (%)12 892 (31) 478 (32) 1171 (36) 334 (35) 684 (36)
10–14 (%) 4515 (11) 198 (13) 467 (14) 175 (18) 304 (16)
15–19 (%) 1558 (4) 78 (5) 143 (4) 70 (7) 120 (6)
20+ (%) 927 (2)60 (4)111 (3) 46 (5) 93 (5)
NA (%) 1528 (4) 75 (5) 118 (4)38 (4) 84 (4)
  • *Inhaled corticosteroid or alternative.

  • †For asthma or wheeze.

  • ‡6% missing data evenly found across asthma groups.

  • §Major or minor.

  • ¶In year preceding Key Stage one assessment proxy start date first May.

  • **Sub-sample due to availability of school absence data, births between Sept 2000-Aug 2004 n=47 140.