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Table 2 Predictors of malaria risk obtained from mixed-effects logistic regression analysis, Butajira area, Ethiopia, October 2008 to June 2010

From: Malaria risk factors in Butajira area, south-central Ethiopia: a multilevel analysis

Fixed-effects   Unadj. OR (95% CI) Adj. OR (95% CI)
Age groups    
 <5   3.71 (2.49-5.52)** 3.62 (2.43-5. 40)**
 5-9   3.40 (2.30-5.02)** 3.39 (2.30-5.01)**
 10-14   1.48 (0.87-2.51) 1.49 (0.88-2.53)
Gender    
 Male   1.33 (0.99-1.79) 1.24 (0.92-1.67)
Altitudinal strata    
 1,800-1,899 m   5.12 (3.29-7.98)** 5.22 (2. 67–10.22)**
  IOR-80%    (3.74-7.24)
 1,900-1,999 m   3. 63 (2.02-6.52)** 3.80 (2.09-6.91)**
  IOR-80%    (2.72-5.26)
Wealth group    
 Lowest   2.02 (1.03-3.94) 0.75 (0.37-1.53)
 Middle   1.32 (0.78-2.22) 1.00 (0.59-1.69)
House status    
 Dilapidated   1.00 (0.60-1.66) 1.00 (0.60-1.67)
 Holes   1.57 (1.11-2.22)* 1.59 (1.12-2.26)*
 IOR-80%    (1.14-2.22)
Seasons    
October-November 2008   7.95 (3.94-16.01)** 7.84 (3.89-15.81)**
 IOR-80%    (5.64-10.91)
January.-February 2009   2.35 (1.05-5.25)* 2.33 (1.04-5.21)*
 IOR-80%    (1.68-3.16)
June-July 2009   3.76 (1.94-7.30)** 3.83 (1.97-7.43)**
 IOR-80%    (2.74-5.31)
October-November 2009   7.68 (4.25-13.88)** 7.71 (4.26-13.93)**
 IOR-80%    (5.53-10.70)
January.-February 2010   2.93 (1.54-5.54)* 3.05 (1.61-5.77)*
 IOR-80%    (2.18-4.22)
Parameters/Models Empty [95%CI] (SE) Individual-predictor [95%CI] (SE) Final [95%CI] (SE)
Fixed-effects    
Village intercept 0.81 [0.49-1.31] (0.25) 0.11 [0.06-0.18] (0.28) 0.01 [0.006-0.03] (0.37)
Village intercept variance 0.80 [0.32-2.01] (0.21) 0. 71 [0.28-1.82] (0.34) 0.034 [0.002-0.615] (0.05)
Random- effects    
ICC (%) 19.5 17.7 1.0
MOR 2.34 (0.21) 2.23 (0.34) 1.19 (0.05)
PCV (%) - 11.2 95.7
  1. *P<0.05, ** P<0.001, IOR-80=interval odds ratio-80, SE, standard error of variance,
  2. ICC, intra-class correlation co-efficient, MOR, median odds ratio, PCV, proportional change variance.