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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