| Overall | Boys | Girls | t-test P value |
---|---|---|---|---|
1995 | Â | Â | Â | Â |
Total | 0.38 (0.90) | 0.33 (0.81) | 0.44 (0.98) |  < 0.001 |
Area | Â | Â | Â | Â |
 Urban | 0.48 (1.00) | 0.40 (0.88) | 0.56 (1.10) |  < 0.001 |
 Rural | 0.29 (0.78) | 0.25 (0.73) | 0.32 (0.83) |  < 0.001 |
Region | Â | Â | Â | Â |
 East | 0.52 (1.05) | 0.43 (0.92) | 0.62 (1.17) |  < 0.001 |
 Central | 0.30 (0.80) | 0.26 (0.75) | 0.35 (0.84) |  < 0.001 |
 West | 0.28 (0.75) | 0.26 (0.69) | 0.30 (0.80) | 0.054 |
2000 | Â | Â | Â | Â |
Total | 0.28 (0.76) | 0.23 (0.68) | 0.32 (0.84) |  < 0.001 |
Area | Â | Â | Â | Â |
 Urban | 0.31 (0.78) | 0.27 (0.71) | 0.35 (0.85) |  < 0.001 |
 Rural | 0.25 (0.75) | 0.20 (0.64) | 0.30 (0.83) |  < 0.001 |
Region | Â | Â | Â | Â |
 East | 0.42 (0.95) | 0.35 (0.84) | 0.49 (1.04) |  < 0.001 |
 Central | 0.14 (0.49) | 0.13 (0.47) | 0.15 (0.51) | 0.137 |
 West | 0.20 (0.63) | 0.16 (0.56) | 0.24 (0.70) |  < 0.001 |
2005 | Â | Â | Â | Â |
Total | 0.31 (0.97) | 0.25 (0.84) | 0.36 (1.09) |  < 0.001 |
Area | Â | Â | Â | Â |
 Urban | 0.32 (1.02) | 0.26 (0.81) | 0.38 (1.19) |  < 0.001 |
 Rural | 0.29 (0.92) | 0.25 (0.86) | 0.34 (0.98) |  < 0.001 |
Region | Â | Â | Â | Â |
 East | 0.39 (1.15) | 0.31 (0.96) | 0.47 (1.32) |  < 0.001 |
 Central | 0.26 (0.93) | 0.23 (0.84) | 0.28 (1.00) | 0.040 |
 West | 0.25 (0.77) | 0.21 (0.68) | 0.30 (0.85) |  < 0.001 |
2010 | Â | Â | Â | Â |
Total | 0.66 (2.13) | 0.57 (1.95) | 0.74 (2.28) |  < 0.001 |
Area | Â | Â | Â | Â |
 Urban | 0.81 (2.65) | 0.71 (2.42) | 0.91 (2.86) |  < 0.001 |
 Rural | 0.50 (1.40) | 0.44 (1.32) | 0.57 (1.48) |  < 0.001 |
Region | Â | Â | Â | Â |
 East | 0.42 (1.03) | 0.32 (0.92) | 0.51 (1.11) |  < 0.001 |
 Central | 0.39 (0.99) | 0.34 (0.88) | 0.44 (1.08) |  < 0.001 |
 West | 1.09 (3.20) | 0.99 (2.94) | 1.18 (3.43) | 0.018 |
2014 | Â | Â | Â | Â |
Total | 0.54 (1.30) | 0.42 (1.08) | 0.66 (1.48) |  < 0.001 |
Area | Â | Â | Â | Â |
 Urban | 0.54 (1.27) | 0.41 (1.06) | 0.67 (1.45) |  < 0.001 |
 Rural | 0.54 (1.33) | 0.43 (1.10) | 0.66 (1.51) |  < 0.001 |
Region | Â | Â | Â | Â |
 East | 0.69 (1.50) | 0.54 (1.27) | 0.84 (1.69) |  < 0.001 |
 Central | 0.46 (1.19) | 0.35 (0.96) | 0.57 (1.37) |  < 0.001 |
 West | 0.46 (1.13) | 0.36 (0.94) | 0.56 (1.29) |  < 0.001 |