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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)