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Table 1 Sample characteristics across the LSAC Waves

From: Are wheezing, asthma and eczema in children associated with mother’s health during pregnancy? Evidence from an Australian birth cohort

VARIABLES

Age 0–1

Age 2–3

Age 4–5

Age 6–7

Age 8–9

Age 10–11

Age 12–13

Age 14–15

n (%)

n (%)

n (%)

n (%)

n (%)

n (%)

n (%)

n (%)

N

4977

4485

4264

4088

3922

3574

3097

2960

EXPOSURE VARIABLES

Mother had asthma during pregnancy

  No

4619 (92.81)

4166 (92.89)

3960 (92.87)

3799 (92.93)

3633 (92.63)

3310 (92.61)

2862 (92.41)

2735 (92.40)

  Yes

358 (7.19)

319 (7.11)

304 (7.13)

289 (7.07)

289 (7.37)

264 (7.39)

235 (7.59)

225 (7.60)

Pre-pregnancy Obesity of Mother

  Underweight

469 (9.42)

429 (9.57)

403 (9.45)

385 (9.42)

367 (9.36)

339 (9.49)

283 (9.14)

271 (9.16)

  Healthy weight

1786 (35.89)

1675 (37.35)

1617 (37.92)

1567 (38.33)

1516 (38.65)

1395 (39.03)

1249 (40.33)

1191 (40.24)

  Overweight

1007 (20.23)

944 (21.05)

917 (21.51)

877 (21.45)

837 (21.34)

782 (21.88)

682 (22.02)

648 (21.89)

  Obesity

714 (14.35)

674 (15.03)

642 (15.06)

619 (15.14)

602 (15.35)

550 (15.39)

483 (15.6)

459 (15.51)

  Not measured

1001 (20.11)

763 (17.01)

685 (16.06)

640 (15.66)

600 (15.3)

508 (14.21)

400 (12.92)

391 (13.21)

Gestational age at birth

  On time (37–41 weeks)

4407 (88.55)

3977 (88.67)

3786 (88.80)

3620 (88.54)

3492 (89.03)

3197 (89.46)

2782 (89.82)

2641 (89.22)

  Early (36 weeks or less)

338 (6.80)

302 (6.73)

290 (6.80)

279 (6.83)

250 (6.37)

220 (6.15)

190 (6.13)

179 (6.04)

  Late (42 weeks or more)

232 (4.65)

206 (4.60)

188 (4.40)

189 (4.63)

180 (4.60)

157 (4.39)

125 (4.04)

140 (4.74)

Mother ever smoked during pregnancy

  No

4224 (84.88)

3797 (84.67)

3616 (84.81)

3451 (84.43)

3368 (85.87)

3063 (85.72)

2655 (85.72)

2549 (86.11)

  Yes

753 (15.12)

688 (15.33)

648 (15.19)

637 (15.57)

554 (14.13)

511 (14.28)

442 (14.28)

411 (13.89)

Mother’s smoking during 1st trimester

  None

4347 (87.35)

3906 (87.08)

3724 (87.33)

3560 (87.09)

3463 (88.3)

3149 (88.11)

2721 (87.84)

2609 (88.13)

   < =10 cigarettes daily

410 (8.23)

372 (8.29)

346 (8.11)

338 (8.26)

301 (7.68)

287 (8.03)

250 (8.09)

233 (7.86)

  11+ cigarettes daily

220 (4.42)

207 (4.62)

194 (4.56)

190 (4.65)

157 (4.01)

138 (3.86)

126 (4.07)

119 (4.01)

Antidepressant medication during pregnancy

  No

4870 (97.86)

4385 (97.78)

4170 (97.79)

3989 (97.59)

3840 (97.92)

3501 (97.97)

3033 (97.93)

2919 (98.63)

  Yes

107 (2.14)

100 (2.22)

94 (2.21)

99 (2.41)

82 (2.08)

73 (2.03)

64 (2.07)

41 (1.37)

Antibiotic medication during pregnancy

  No

4452 (89.46)

4009 (89.38)

3816 (89.5)

3658 (89.49)

3502 (89.28)

3202 (89.59)

2773 (89.53)

2642 (89.27)

  Yes

525 (10.54)

476 (10.62)

448 (10.5)

430 (10.51)

420 (10.72)

372 (10.41)

324 (10.47)

318 (10.73)

CONTROL VARIABLES

Child Health Issues

Birth weight

  Normal (2500–3999)

4071 (81.79)

3677 (81.99)

3490 (81.84)

3343 (81.78)

3198 (81.53)

2896 (81.02)

2510 (81.04)

2400 (81.08)

  Low (< 2500)

279 (5.61)

237 (5.29)

245 (5.75)

237 (5.79)

202 (5.15)

192 (5.38)

168 (5.42)

156 (5.27)

  High (> = 4000)

627 (12.59)

571 (12.73)

529 (12.41)

508 (12.43)

522 (13.32)

486 (13.61)

419 (13.54)

404 (13.65)

Immunisation status of children

  Up to date

4516 (90.74)

4091 (91.21)

3885 (91.1)

3694 (90.36)

3557 (90.7)

3258 (91.16)

2841 (91.72)

2700 (91.21)

  Not up to date

461 (9.26)

394 (8.79)

379 (8.9)

394 (9.64)

365 (9.3)

316 (8.84)

256 (8.28)

260 (8.79)

Breastfed children up to 6 months

  Yes

2328 (46.78)

2092 (46.65)

2008 (47.1)

1934 (47.31)

1891 (48.22)

1745 (48.83)

1551 (50.07)

1491 (50.39)

  No

2649 (53.22)

2393 (53.35)

2256 (52.9)

2154 (52.69)

2031 (51.78)

1829 (51.17)

1546 (49.93)

1469 (49.61)

Mother’s sleep quality in the year of childbirth

  Very good/Fairly good

3478 (69.89)

3127 (69.72)

2966 (69.56)

2844 (69.57)

2736 (69.77)

2484 (69.5)

2149 (69.39)

2047 (69.16)

  Fairly bad

1118 (22.46)

1000 (22.3)

961 (22.53)

921 (22.53)

899 (22.91)

817 (22.85)

715 (23.08)

685 (23.13)

  Very bad

381 (7.66)

358 (7.98)

337 (7.91)

323 (7.9)

287 (7.32)

273 (7.65)

233 (7.53)

228 (7.71)