Table 3: Prevalence of anemia according to obstetrical characteristics.

VariableHb level (mg/dl)AnemiaTotal P value
Mean (SD)NoYes

Ferrus sulphate intake in this pregnancy0.002
 Yes11.2 (1.2)241 (60.4)158 (39.6)399
 No11.6 (1)261 (71.8)85 (28.2)301
Gravidity0.618
 One11.4 (1.2)115 (68.9)52 (31.1)167
 Two11.1 (1)75 (60)50 (40)125
 Three11.4 (1.1)69 (63.9)39 (36.1)108
 Four11.5 (1.1)59 (66.3)30 (33.7)89
 ≥five11.4 (1.2)139 (65.9)72 (34.1)211
Parity0.713
 Zero11.4 (1.2)130 (68.4)60 (31.6)190
 One11.3 (1.1)85 (61.2)54 (38.8)139
 Two11.4 (1.1)81 (66.4)41 (33.6)122
 Three11.4 (1.1)57 (65.5)30 (34.5)87
 ≥four11.3 (1.2)104 (64.5)58 (35.5)162
Previous cesarean section0.461
 Yes11.5 (1.3)71 (62.3)43 (37.7)114
 No11.3 (1.1)386 (65.9)200 (34.1)586
Trimester<0.005
 1st12 (1.1)116 (81.1)27 (18.9)143
 2nd11.4 (1)142 (67.3)69 (32.7)211
 3rd11.1 (1.2)199 (57.5)147 (42.5)346
Interpregnancy interval/months0.769
 1st pregnancy11.4 (1.2)118 (67.4)57 (32.6)175
 <1211.4 (1.2)93 (67.4)45 (32.6)138
 12–23.911.4 (1.2)102 (63.4)59 (36.6)161
 ≥2411.3 (1)144 (63.7)82 (36.3)226
Body mass index (kg/m²)0.372
  Underweight (<19.8)11.3 (1.6)8 (50)8 (50)16
 Normal (19.8–26)11.3 (1.2)154 (63.4)89 (36.6)243
  Overweight (26–29)11.4 (1.1)108 (64.7)59 (35.3)167
 Obese (>29)11.4 (1.1)187 (68.2)87 (31.8)274