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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

VariableBMI  
 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 years38 (2.4)60 (2.2)34 (2.9)10 (3.4)7 (7.3)239 (4)χ2 = 16.2
 25–35938 (58.4)1545 (56.8)697 (60.5)192 (65.5)66 (68.8)3438 (57.6)df = 1
  > 35 years631 (39.3)1117 (41.0)422 (36.6)91 (31.1)23 (24.0)2284 (38.3) 
Level of education      <  0.001
 None0 (0.0)4 (0.1)2 (0.2)2 (0.7)0 (0.0)8 (0.1)χ2 = 99.9
 Primary28 (1.7)48 (1.8)21 (1.8)6 (2.0)3 (3.1)106 (1.8)df = 1
 Secondary340 (21.2)715 (26.3)379 (32.9)132 (45.1)45 (46.9)1611 (27.4) 
 University1239 (77.1)1955 (71.8)751 (65.1)153 (52.2)48 (50.0)4146 (70.6) 
Monthly family income (euros)      <  0.001
  < 100081 (5.0)139 (5.1)74 (6.4)30 (10.2)9 (9.4)333 (5.7)χ2 = 69.4
 1000–2000469 (29.2)891 (32.7)416 (36.1)128 (43.7)45 (46.9)1849 (32)df = 1
 2000–3000571 (35.5)924 (33.9)397 (34.4)83 (28.3)29 (30.2)2004 (34.7) 
 3000–4000331 (20.6)533 (19.6)202 (17.5)41 (14.0)9 (9.4)1116 (19.3) 
  > 4000155 (9.6)235 (8.6)64 (5.6)11 (3.8)4 (4.2)469 (8.1) 
Nationality      0.91
 Spanish1508 (93.8)2557 (93.9)1076 (93.3)276 (94.2)92 (95.8)5509 (93.8)χ2 = 0.01
 Foreign99 (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
 No375 (23.3)602 (22.1)271 (23.5)61 (20.8)35 (36.5)1344 (22.8)χ2 = 0.86
 Yes1232 (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
 No1296 (80.6)2104 (77.3)834 (72.3)201 (68.6)69 (71.9)4504 (76.7)χ2 = 36.1
 Yes311 (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