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Table 9 Differentials in infant mortality rates (source: household survey)

From: Health and survival of young children in southern Tanzania

  Category Deaths Child-years Mortality rate per 1000 child-years RR 95% CI* P*
Year (July–June) 2001–2 184 2,218.8 82.9 1   0.72 (for trend P = 0.75)
  2002–3 183 2,324.7 78.7 0.95 0.8 – 1.2  
  2003–4 227 2,659.8 85.3 1.03 0.8 – 1.3  
Mother's age at delivery 20–29 261 3,398.7 76.8 1   0.005
  30–39 124 1,702.2 72.8 0.95 0.8 – 1.2  
  40–49 27 364.5 74.1 0.96 0.6 – 1.4  
  Under 20 181 1,718.8 105.3 1.37 1.1 – 1.7  
Mother's education One or more years 399 5,123.9 77.9 1   0.038
  None 194 2,063.6 94.0 1.21 1.0 – 1.4  
Sex Girls 287 3,537.7 81.1 1   0.70
  Boys 307 3,665.5 83.8 1.03 0.9 – 1.2  
Twins Singleton 518 6,980.1 74.2 1   <0.0001
  Twin 76 223.2 340.5 4.59 3.4 – 6.2  
Age 0–27 days 337 574.2 586.9 1   <0.0001
  28–365 days 257 6,629.0 38.8 0.07 0.06 – 0.08  
Ethnic group of household head Makonde 220 3,075.8 71.5 1   0.01
  Mwera 246 2,867.3 85.8 1.20 1.0 – 1.4  
  Yao 29 318.7 91.0 1.27 0.8 – 2.0  
  Other 99 926.2 106.9 1.49 1.2 – 1.9  
Gender of household head Male 478 5,695.9 83.9 1   0.48
  Female 116 1,493.2 77.7 0.93 0.7 – 1.1  
SES quintile of household Poorest 109 1,291.1 84.4 1   0.90 (test for trend)
  Very poor 122 1,577.9 77.3 0.92 0.7 – 1.2  
  Poor 102 1,182.1 86.3 1.02 0.8 – 1.4  
  Less poor 129 1,540.9 83.7 0.99 0.8 – 1.3  
  Least poor 120 1,513.7 79.3 0.94 0.7 – 1.2  
Distance to nearest health facility <5 km 363 4,778.9 76.0 1   0.02
  ≥ 5 km 196 2,061.2 95.1 1.25 1.0 – 1.5  
Effect of child's age on the relationship between twinning and mortality:
Twins under 28 days (neonates) Singleton 280 556.6 503.0 1   <0.0001
  Twin 57 17.6 3,242.6 6.45 4.5 – 9.2  
Twins over 28 days (1–11 m) Singleton 238 6,423.4 37.1 1   <0.0001
  Twin 19 205.6 92.4 2.49 1.5 – 4.0  
Effect of child's age on the relationship between maternal education and mortality:
In neonates: Mother's education ≥ 1 year 238 407.4 584.3 1   0.93
  None 98 165.9 590.8 1.01 0.8 – 1.3  
In 1–11 month olds: Mother's education ≥ 1 year 161 4,716.7 34.1 1   0.003
  None 96 1,897.8 50.6 1.48 1.1 – 1.9  
Effect of distance from the health facility on the relationship between maternal education and mortality
In those living < 5 km from a health facility: mothers education ≥ 1 year 239 3,466. 68.9 1   
  None 123 1,305.3 94.2 1.4 1.1 – 1.7 0.005
In those living ≥ 5 km from a health facility: mothers education ≥ 1 year 140 1,421.5 98.5 1   
  None 56 637.9 87.8 0.9 0.7 – 1.2 0.47
  1. * From Poisson regression, adjusted for clustering from survey design