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Table 1 Characteristics of mothers and children delivered by cesarean and vaginal delivery

From: Increased risk of allergic rhinitis among children delivered by cesarean section: a cross-sectional study nested in a birth cohort

Variables

Total (n = 672)

N (%)

Cesarean delivery (n = 325)

N (%)

Vaginal delivery (n = 347)

N (%)

P **

Current age of the child in months (X ± SD) a

72.66 (5.32)

72.97 (5.18)

72.38 (5.43)

0.149

Age of the mother at the time of birth

  < 20 years

104 (15.5)

33 (10.2)

71 (20.5)

<0.001

  ≥ 20 years

568 (84.5)

292 (89.8)

276 (79.5)

Gender of newborn

 Male

336 (50)

156 (48)

180 (51.9)

0.316

 Female

336 (50)

169 (52)

167 (48.1)

Weight at birth

  < 2.500 kg

30 (4.5)

312 (96)

330 (95.1)

0.570

  ≥ 2.500 kg

642 (95.5)

13 (4)

17 (4.9)

Gestational age

 <37 weeks

28 (4.2)

24 (7,4)

19 (5.5)

0.079

 ≥37 weeks

644 (95.7)

301 (92.6)

328 (94.5)

Family income

 Up to 2 minimum wages

477 (71)

153 (47.1)

42 (12.1)

<0.001

  > 2 minimum wages

195 (29)

172 (52.9)

305 (87.9)

Mother’s schooling level

 Up to 8 years of schooling

202 (30.1)

265 (81.5)

205 (59.1)

<0.001

  > 8 years of schooling

470 (69.9)

60 (18.5)

142 (40.9)

Exclusive breastfeeding up to the 4th month

 Yes

137 (20.4)

76 (23.4)

61 (17.6)

0.062

 No

535 (79.6)

249 (76.6)

286 (82.4)

Smoking during pregnancy

 Yes

20 (3)

10 (3.1)

10 (2.9)

0.882

 No

652 (97)

315 (96.9)

337 (97.1)

Number of persons who sleep in the room with the child

 <4 people

641 (95.1)

316 (97.2)

325 (93.7)

0.027

 ≥4 people

31 (4.6)

9 (2.8)

22 (6.3)

Frequency at nursery to the age of 2 years

 Yes

104 (15.5)

74 (22.8)

30 (8.6)

<0.001

 No

568 (84.5)

251 (77.2)

317 (91.4)

Pneumonia ever in life

 Yes

41 (6.1)

17 (5.2)

24 (6.9)

0.362

 No

631 (93.9)

308 (94.8)

323 (93.1)

Bronchiolitis in the 1st year

 Yes

65 (9.7)

27 (8.3)

38 (11)

0.247

 No

607 (90.2)

298 (91.7)

309 (89)

Maternities

 Private

199 (29.6)

154 (47.4)

45 (13)

<0.001

 Public

473 (70.4)

171 (52.6)

302 (87)

  1. ** Chi-square Test
  2. a Student’s Test