Skip to main content

Table 2 Distribution of anemia (after CDC altitude adjustment) by characteristics of women and odds ratios of anemia from multiple logistic regression model analysis (N = 380)

From: Hemoglobin levels and anemia evaluation during pregnancy in the highlands of Tibet: a hospital-based study

   Multiple logistic regression analysisd
Characteristics Prevalence of anemia (%) (95%CI) odds ratio (95% CI) P-value
Gestational agea   1.89 (1.25, 2.85) 0.003
   1st trimester 53.1 (38.6, 67.5)   
   2nd trimester 66.4 (57.8, 75.0)   
   3rd trimester 75.9 (70.1, 81.7)   
Age   1.30 (0.91, 1.85) 0.166
   <25 66.7 (58.2, 75.1)   
   25-30 70.3 (63.3, 77.5)   
   30+ 73.1 (63.6, 82.1)   
Ethnicity   0.45 (0.23, 0.88) 0.006
   Tibetan 71.2 (66.2, 76.0)   
   Non-Tibetanb 60.4 (46.1, 74.8)   
Residence   0.39 (0.24, 0.69) 0.004
   Urban 75.2 (69.3, 80.5)   
   Ruralc 61.6 (53.7, 69.6)   
Parity   0.79 (0.57, 1.11) 0.170
   0 71.3 (64.5, 78.2)   
   1 72.5 (64.4, 80.6)   
   2+ 63.2 (52.4, 73.2)   
Annual income ($)   0.37 (0.16, 0.84) 0.011
   <264 82.1 (71.8, 94.1)   
   264+ 68.0 (62.8, 72.9)   
Total 70.0 (65.4, 74.6)   
  1. aGestational age is in logarithmic scale
  2. bNon-Tibetan include Han, Hui, Menba, Luoba and Naxi nationalities residing permanently in Tibet
  3. cRural includes agricultural and pastoral areas
  4. dOutcome in the logistic regression model defined as 0 for Hb ≥ 110 and 1 for Hb<110