TABLE 2

Birth Characteristics of Children Unexposed and Exposed to Anesthesia before 3 Years of Age

Unexposed (n = 2287), n (%)Exposed (n = 321), n (%)PaMissing (n = 260), n (%)Pb
Gender
 Girls1161 (50.8)112 (34.9)<.0001140 (53.9).12
 Boys1126 (49.2)209 (65.1)120 (46.2)
Birth weight
 <1400 g31 (1.4)8 (2.5).614 (5.4).0006
 1400–1999 g39 (1.7)7 (2.2)3 (1.2)
 2000–2499 g119 (5.2)18 (5.6)13 (5.0)
 2500–2999 g390 (17.1)55 (17.1)44 (16.9)
 3000–3999 g1503 (65.7)202 (62.9)156 (60.0)
 ≥4000 g197 (8.6)31 (9.7)28 (10.8)
 Unknown8 (0.3)0 (0.0)2 (0.7)
Apgar at 5 min
 0–636 (1.6)5 (1.6).315 (5.8)<.0001
 7–102236 (97.8)316 (98.4)239 (91.9)
 Unknown15 (0.7)0 (0.0)6 (2.3)
Race
 Caucasian1981 (86.6)296 (92.2).001196 (75.4)<.0001
 Non-Caucasian257 (11.2)15 (4.7)59 (22.7)
 Unknown49 (2.1)10 (3.1)5 (1.9)
Household income (AUD)
 < $7000164 (7.2)23 (7.2).0342 (16.2)<.0001
 $7000–$23999709 (31.0)111 (34.6)106 (40.8)
 $24000 – $35999551 (24.1)59 (18.4)38 (14.6)
 ≥ $36000687 (30.0)113 (35.2)35 (13.5)
 Unknown176 (7.7)15 (4.7)39 (15.0)
Father living at home
 Home1950 (85.3)272 (84.7).5190 (73.1)<.0001
 Not at home272 (11.9)36 (11.2)60 (23.1)
 Unknown65 (2.8)13 (4.0)10 (3.9)
Maternal education beyond high school
 None1119 (48.9)159 (49.5).4170 (65.4)<.0001
 Trade certificate, professional registration or other508 (22.2)78 (24.3)42 (16.2)
 College or university degree611 (26.7)74 (23.1)43 (16.5)
 Unknown49 (2.1)10 (3.1)5 (1.9)
Maternal perinatal smoking
 No1584 (69.3)216 (67.3).6105 (40.4)<.0001
 1–20 daily443 (19.4)60 (18.7)70 (26.9)
 21 or more daily51 (2.2)8 (2.5)12 (4.6)
 Unknown209 (9.1)37 (11.5)73 (28.1)
Maternal perinatal alcohol use
 Several times per week115 (5.0)14 (4.4).65 (1.9)<.0001
 Once a week185 (8.1)31 (9.7)15 (5.8)
 Less than once a week491 (21.4)65 (20.2)35 (13.5)
 Never1266 (55.4)172 (53.6)130 (50.0)
 Unknown230 (10.1)39 (12.1)75 (28.9)
  • Because of rounding, percentages may not sum to 100. AUD, Australian dollar.

  • a Exposed children were compared with unexposed children with χ2 tests.

  • b Missing children were compared with all other children (exposed and unexposed) with χ2 tests.