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Table 1 Characteristics, hemoglobin concentration and correlates of Hb of study sample (g/L)

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

    Multiple linear regression analysisd
Characteristics n (%) Mean ± s.d. (95% CI) of Hb (g/L) Coeff (95% CI) P-value
Gestational agea    -0.25 (-0.44, -0.05) 0.012
   1st trimester 49 (12.9) 135.8 ± 20.9 (132.2, 143.8)   
   2nd trimester 119 (31.3) 128.0 ± 21.0 (124.4, 132.2)   
   3rd trimester 212 (55.8) 125.6 ± 18.3 (123.3, 128.5)   
Age    -0.14 (-0.59, 0.30) 0.524
   <25 123 (32.4) 128.6 ± 20.0 (125.4, 132.9)   
   25-30 163 (42.9) 128.0 ± 19.1 (125.4, 131.5)   
   30+ 93 (24.5) 125.7 ± 20.7 (122.3, 130.9)   
Ethnicity    8.09 (1.68, 14.50) 0.013
   Tibetan 330 (86.8) 126.6 ± 20.2 (124.9, 129.4)   
   Non-Tibetanb 50 (13.2) 134.6 ± 15.1 (130.8, 139.5)   
Residence    5.66 (1.03, 10.30) 0.017
   Urban 234 (61.6) 125.9 ± 18.9 (124.1, 129.1)   
   Ruralc 146 (38.4) 130.4 ± 20.9 (127.3, 134.4)   
Parity    1.23 (-1.72, 4.17) 0.414
   0 173 (45.5) 127.4 ± 19.1 (124.7, 130.6)   
   1 120 (31.6) 126.4 ± 21.2 (123.0, 130.9)   
   2+ 87 (22.9) 130.5 ± 18.9 (126.8, 135.2)   
Annual income ($)    10.65 (3.04, 18.25) 0.006
   <264 49 (12.9) 119.8 ± 22.6 (111.0, 128.5)   
   264+ 331(87.1) 128.8 ± 19.5 (126.8, 131.0)   
Total 380 (100.0) 127.6 ± 19.8 (125.7, 129.6)   
  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. dCoeff: regression coefficient; CI: Confidence Interval