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Table 2 Obstetric 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*
Number of pregnancies      0.006
 One860 (53.5)1456 (53.5)611 (53.0)149 (50.9)50 (52.1)3126 (56.1)χ2 = 7.4
 Two562 (35.0)910 (33.4)356 (30.9)99 (33.8)31 (32.3)1658 (29.7)df = 1
 Three137 (8.5)232 (8.5)120 (10.4)33 (11.3)11 (11.5)533 (9.5) 
 Four36 (2.2)84 (3.1)39 (3.4)8 (2.7)2 (2.1)169 (3) 
 Five or more12 (0.7)40 (1.5)27 (2.3)4 (1.4)2 (2.1)85 (1.5) 
Number of deliveries      <  0.001
 None259 (16.1)595 (21.9)311 (27.0)98 (33.4)33 (34.4)1296 (22.1)χ2 = 40.0
 One869 (54.1)1391 (51.1)542 (47.0)132 (45.1)40 (41.7)2974 (50.7)df = 1
 Two422 (26.3)645 (23.7)261 (22.6)50 (17.1)20 (20.8)1398 (23.8) 
 Three48 (3.0)80 (2.9)33 (2.9)10 (3.4)3 (3.1)164 (2.8) 
 Four9 (0.6)10 (0.4)4 (0.3)1 (0.3)0 (0.0)24 (0.4) 
 Five or more0 (0.0)1 (0.0)2 (0.2)2 (0.7)0 (0.0)5 (0.0) 
Twin pregnancy      0.004
 No1583 (98.5)2652 (97.4)1118 (97.0)284 (96.9)92 (95.8)5729 (97.6)χ2 = 8.5
 Yes24 (1.5)70 (2.6)35 (3.0)9 (3.1)4 (4.2)142 (2.4)df = 1
Prematurity      0.03
  > 371472 (91.6)2557 (93.9)1065 (92.4)278 (94.9)93 (96.9)5465 (93.1)χ2 = 4.5
  < 37135 (8.4)165 (6.1)88 (7.6)15 (5.1)3 (3.1)406 (6.9)df = 1
Hypertensive states      <  0.001
 No1550 (96.5)2568 (94.3)1032 (89.5)239 (81.6)77 (80.2)5466 (93.1)χ2 = 130.7
 Yes57 (3.5)154 (5.7)121 (10.5)54 (18.4)19 (19.8)405 (6.9)df = 1
Gestational diabetes-diet      <  0.001
 No1429 (88.9)2463 (90.5)988 (85.7)223 (76.1)75 (78.1)5178 (88.2)χ2 = 39.7
 Yes178 (11.1)259 (9.5)165 (14.3)70 (23.9)21 (21.9)693 (11.8)df = 1
Gestational diabetes-insulin      <  0.001
 No1575 (98.0)2660 (97.7)1124 (97.5)275 (93.9)89 (92.7)5723 (97.5)χ2 = 16.1
 Yes32 (2.0)62 (2.3)29 (2.5)18 (6.1)7 (7.3)148 (2.5)df = 1
Hyperthyroidism      0.34
 No1528 (95.1)2601 (95.6)1100 (95.4)272 (92.8)90 (93.8)5591 (95.2)χ2 = 0.9
 Yes79 (4.9)121 (4.4)53 (4.6)21 (7.2)6 (6.3)280 (4.7)df = 1
Hypothyroidism      0.43
 No1398 (87.0)2375 (87.3)984 (85.3)251 (85.7)86 (89.6)5094 (86.7)χ2 = 0.6
 Yes209 (13.0)347 (12.7)169 (14.7)42 (14.3)10 (10.4)777 (13.3)df = 1
Anaemia      0.03
 No967 (60.2)1605 (59.0)732 (63.5)186 (63.5)63 (65.6)3553 (60.5)χ2 = 4.5
 Yes640 (39.8)1117 (41.0)421 (36.5)107 (36.5)33 (34.4)2318 (39.5)df = 1
       0.50
 No1584 (98.6)2691 (98.9)1137 (98.6)291 (99.3)95 (99.0)5798 (98.7)χ2 = 0.5
 Yes23 (1.4)31 (1.1)16 (1.4)2 (0.7)1 (1.0)73 (1.3)df = 1
Risk of preterm birth      0.003
 No1433 (89.2)2529 (92.9)1062 (92.1)276 (94.2)87 (90.6)5387 (91.7)χ2 = 8.9
 Yes174 (10.8)193 (7.1)91 (7.9)17 (5.8)9 (9.4)484 (8.2)df = 1
Deep vein thrombosis      0.75
 No1580 (98.3)2695 (99.0)1138 (98.7)289 (98.6)92 (95.8)5794 (98.6)χ2 = 0.1
 Yes27 (1.7)27 (1.0)15 (1.3)4 (1.4)4 (4.2)77 (1.3)df = 1
Oligohydramnios      0.07
 No1561 (97.1)2618 (96.2)1092 (94.7)285 (97.3)93 (96.9)5649 (96.2)χ2 = 3.3
 Yes46 (2.9)104 (3.8)61 (5.3)8 (2.7)3 (3.1)222 (3.8)df = 1
Polyhydramnios      0.001
 No1502 (93.5)2480 (91.1)1037 (89.9)259 (88.4)82 (85.4)5360 (91.3)χ2 = 18.8
 Yes105 (6.5)242 (8.9)116 (10.1)34 (11.6)14 (14.6)511 (8.7)df = 1
Composite pregnancy morbidity      0.02
 No621 (38.6)1051 (38.6)419 (36.3)93 (31.7)31 (32.3)2215 (37.7)χ2 = 5.9
 Yes986 (61.4)1671 (61.4)734 (63.7)200 (68.3)65 (67.7)3656 (62.3)df = 1
  1. *Pearson’s χ2 test. df: degrees of freedom. Statistical significance at p ≤ 0.05