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Table 2 Effects of different variables on haemoglobin status of pregnant women expressed as regression coefficients (β) with 95% CI

From: Haemoglobin status and predictors of anaemia among pregnant women in Mpigi, Uganda

   Crude analysis   Adjusted analysis
Characteristic β (95% CI) P-value β (95% CI) P- value*
Age in years     
 Below 20 -0.21 (-0.36, -0.06) 0.006 -0.19 (-0.36, -0.02) 0.07
 20-24 Ref  
 25-29 0.11 (-0.03, 0.24) 0.10 (-0.06, 0.25)
 30-34 0.02 (-0.20, 0.24) -0.03 (-0.28, 0.23)
 ≥35 -0.03 (-.26, 0.19) -0.05 (-0.34, 0.23)
Parity     
 Nulliparous -0.20 (-0.37, -0.03) 0.08 -0.14 (-0.33, 0.06) 0.38
 1 -0.12 (-0.30, 0.05) -0.12 (-0.30, 0.05)
 2 Ref Ref
 3 0.05 (-0.16, 0.26) 0.05 (-0.16, 0.26)
 4 -0.10 (-0.33, 0.12) -0.12 (-0.35, 0.12)
 Para 5+ -0.01 (-0.22, 0.20) 0.03 (-0.22, 0.29)
Timing of 1st antenatal visit    
 1st trimester Ref 0.03 Ref 0.05
 2nd trimester 0.24 (0.06, 0.43) 0.21 (0.03, 0.40)
 3rd trimester 0.20 (0.00, 0.40) 0.26 (0.04, 0.48)
Gestational age at enrolment 0.05 (0.03, 0.06) <0.001 0.03 (0.01, 0.05) <0.001
Iron supplements (number of tablets)    
 None Ref <0.001   <0.001
 1-30 0.27 (0.15, 0.39) 0.32 (0.19, 0.45)
 31-60 0.40 (0.22, 0.58) 0.37 (0.17, 0.58)
 61+ 0.47 (0.23, 0.71) 0.53 (0.27, 0.80)
Doses of antihelminthics taken    
 Zero -0.14 (-0.30, 0.01) 0.15 0.12 (-0.11, 0.35) 0.54
 One -0.10 (-0.22, 0.03) 0.09 (-0.10, 0.28)
 Two Ref  
Doses of antimalarial prophylaxis (IPT)    
 Zero -0.21 (-0.37, -0.05) 0.004 0.03 (-0.20, 0.25) 0.20
 One -0.18 (-0.30, -0.06) -0.12 (-0.30, 0.06)
 Two Ref  
Episodes of malaria     
 None Ref 0.02   0.02
 One -0.13 (-0.26, 0.003) -0.14 (-0.27, -0.01)
 Two -0.29 (-0.48, -0.10) -0.29 (-0.47, -0.10)
 Three -0.01 (-0.30, 0.28) 0.01 (-0.29, 0.29)
 Four + -0.19 (-0.64, 0.26) -0.16 (-0.60, 0.29)
HIV Sero-status     
 Negative Ref <0.001   <0.001
 Positive -0.54 (-0.74, -0.33)   -0.63 (-0.85, -0.42)
  1. HIV: Human Immunodeficiency Virus; ARVs: Antiretroviral treatment.
  2. *p-values are from the F-test after adjusting for variables that had a univariate p-value <0.2 (age, parity timing of first ANC visit, gestational age at enrolment, iron supplementation, antihelminthics, IPT malaria & HIV infection).