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Table 1 Differences in maternal and child characteristics in Wayne County Health, Environment, Allergy and Asthma Longitudinal Study participants with and without the 10–12 year questionnaire data, before and after inverse probability weighting (IPW)

From: Prenatal pet keeping and caregiver-reported attention deficit hyperactivity disorder through preadolescence in a United States birth cohort

Covariate

 

Completed the 10–12-Year Questionnaire

Before IPW

After IPW

No

N = 613

Yes

N = 645

Pa

Db

Pa

Db

Maternal Characteristic

 

Mean ± SD or N (%)

    

 Age at delivery (years)

 

28.9 ± 5.1

30.2 ± 5.3

< 0.001

0.25

0.642

0.02

 Race

White

133 (21.7%)

157 (24.3%)

0.570

0.10

0.962

0.03

Black

387 (63.1%)

391 (60.6%)

Hispanic

40 (6.5%)

38 (5.9%)

Arabic

31 (5.1%)

28 (4.3%)

Mixed/Other

22 (3.6%)

31 (4.8%)

 Marital status

Unmarried

273 (44.5%)

212 (32.9%)

< 0.001

0.24

0.335

0.04

Married

340 (55.5%)

433 (67.1%)

 Insurance coverage

HAP

169 (27.6%)

333 (51.6%)

< 0.001

0.71

0.815

0.04

Other insurance

198 (32.3%)

233 (36.1%)

No insurance

9 (1.5%)

6 (0.9%)

Refused/do not know/missing

237 (38.7%)

73 (11.3%)

 Household income

<$20,000

112 (18.3%)

70 (10.9%)

< 0.001

0.32

0.938

0.05

$20,000- < $40,000

150 (24.5%)

145 (22.5%)

$40,000- < $80,000

173 (28.2%)

174 (27.0%)

$80,000- < $100,000

49 (8.0%)

86 (13.3%)

≥$100,000

52 (8.5%)

96 (14.9%)

Refused to answer

77 (12.6%)

74 (11.5%)

 Education

<HS diploma

50 (8.2%)

24 (3.7%)

< 0.001

0.41

0.967

0.02

HS diploma

131 (21.4%)

97 (15.0%)

Some college

313 (51.1%)

292 (45.3%)

≥Bachelor’s degree

119 (19.4%)

232 (36.0%)

 Mother smoked during pregnancy

No

517 (84.3%)

591 (91.6%)

< 0.001

− 0.23

0.420

− 0.03

Yes

96 (15.7%)

54 (8.4%)

 ETS during pregnancy

No

421 (68.7%)

490 (76%)

0.004

−0.16

0.666

−0.02

Yes

192 (31.3%)

155 (24%)

 Prenatal alcohol use

No

590 (96.6%)

616 (95.7%)

0.405

0.05

0.330

−0.04

Yes

21 (3.4%)

28 (4.3%)

 Location of residence

Suburban

250 (40.8%)

305 (47.3%)

0.020

−0.13

0.224

−0.05

Urban

363 (59.2%)

340 (52.7%)

 Doctor-diagnosed hay fever or allergic rhinitis

No

516 (85.0%)

538 (84.9%)

0.941

0.001

0.613

0.02

Yes

91 (15.0%)

96 (15.1%)

 Doctor-diagnosed asthma

No

492 (80.3%)

513 (79.7%)

0.790

0.01

0.584

0.02

Yes

121 (19.7%)

131 (20.3%)

 Prenatal indoor dog(s)

No

476 (77.7%)

479 (74.3%)

0.160

0.08

0.797

−0.01

Yes

137 (22.3%)

166 (25.7%)

 Prenatal indoor cat(s)

No

520 (84.8%)

535 (82.9%)

0.364

0.05

0.538

0.02

Yes

93 (15.2%)

110 (17.1%)

Clinical Characteristics

       

 Mode of delivery

Vaginal

385 (63.4%)

399 (62.1%)

0.616

0.03

0.513

−0.03

C-section

222 (36.6%)

244 (37.9%)

 Firstborn

No

401 (65.4%)

397 (61.6%)

0.155

0.08

0.986

−0.001

Yes

212 (34.6%)

248 (38.4%)

 Child sex

Male

308 (50.3%)

314 (48.7%)

0.560

0.03

0.557

0.02

Female

304 (49.7%)

331 (51.3%)

 Gestational age at delivery (weeks)c

 

38.7 ± 1.8

(N = 595)

38.8 ± 1.7

(N = 637)

0.307

0.05

0.902

0.004

 Birthweight (grams)c

 

3258 ± 548

(N = 567)

3346 ± 594

(N = 615)

0.008

0.15

0.880

−0.006

 Completed 2-year clinic visit

No

425 (69.3%)

137 (21.2%)

< 0.001

1.10

0.596

0.02

Yes

188 (30.7%)

508 (78.8%)

  1. ETS environmental tobacco smoke, HAP Health Alliance Plan, HS high school, SD standard deviation
  2. aCalculated using chi-square test for categorical covariates and analysis of variance for continuous covariates. Bold values indicate statistically significant P<0.05
  3. bStandardized difference (difference in means or proportions divided by standard error); imbalance defined as absolute value> 0.20
  4. cContinuous covariates with missing data, sample size is presented
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BMC Pediatrics

ISSN: 1471-2431

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