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Table 1 Sociodemographic characteristics of the women according to their BMI

From: Relationship between maternal body mass index with the onset of breastfeeding and its associated problems: an online survey

Variable

BMI

  
 

Normoweight

n (%)

Overweight

n (%)

Obesity type I n (%)

Obesity type II n (%)

Obesity type III n (%)

Total Values

n (%)

P - value*

Maternal age

      

<  0.001

  < 25 years

38 (2.4)

60 (2.2)

34 (2.9)

10 (3.4)

7 (7.3)

239 (4)

χ2 = 16.2

 25–35

938 (58.4)

1545 (56.8)

697 (60.5)

192 (65.5)

66 (68.8)

3438 (57.6)

df = 1

  > 35 years

631 (39.3)

1117 (41.0)

422 (36.6)

91 (31.1)

23 (24.0)

2284 (38.3)

 

Level of education

      

<  0.001

 None

0 (0.0)

4 (0.1)

2 (0.2)

2 (0.7)

0 (0.0)

8 (0.1)

χ2 = 99.9

 Primary

28 (1.7)

48 (1.8)

21 (1.8)

6 (2.0)

3 (3.1)

106 (1.8)

df = 1

 Secondary

340 (21.2)

715 (26.3)

379 (32.9)

132 (45.1)

45 (46.9)

1611 (27.4)

 

 University

1239 (77.1)

1955 (71.8)

751 (65.1)

153 (52.2)

48 (50.0)

4146 (70.6)

 

Monthly family income (euros)

      

<  0.001

  < 1000

81 (5.0)

139 (5.1)

74 (6.4)

30 (10.2)

9 (9.4)

333 (5.7)

χ2 = 69.4

 1000–2000

469 (29.2)

891 (32.7)

416 (36.1)

128 (43.7)

45 (46.9)

1849 (32)

df = 1

 2000–3000

571 (35.5)

924 (33.9)

397 (34.4)

83 (28.3)

29 (30.2)

2004 (34.7)

 

 3000–4000

331 (20.6)

533 (19.6)

202 (17.5)

41 (14.0)

9 (9.4)

1116 (19.3)

 

  > 4000

155 (9.6)

235 (8.6)

64 (5.6)

11 (3.8)

4 (4.2)

469 (8.1)

 

Nationality

      

0.91

 Spanish

1508 (93.8)

2557 (93.9)

1076 (93.3)

276 (94.2)

92 (95.8)

5509 (93.8)

χ2 = 0.01

 Foreign

99 (6.2)

165 (6.1)

77 (6.7)

17 (5.8)

4 (4.2)

362 (6.2)

df = 1

Attendance to maternal education

      

0.36

 No

375 (23.3)

602 (22.1)

271 (23.5)

61 (20.8)

35 (36.5)

1344 (22.8)

χ2 = 0.86

 Yes

1232 (76.7)

2120 (77.9)

882 (76.5)

232 (79.2)

61 (63.5)

4527 (77.2)

df = 1

Pre-pregnancy smoking habits

      

<  0.001

 No

1296 (80.6)

2104 (77.3)

834 (72.3)

201 (68.6)

69 (71.9)

4504 (76.7)

χ2 = 36.1

 Yes

311 (19.4)

618 (22.7)

319 (27.7)

92 (31.4)

27 (28.1)

1367 (23.3)

df = 1

  1. *Pearson’s χ2 test. df: degrees of freedom. Statistical significance at p ≤ 0.05