Table 2

Characteristics (in 1995 census) of selected combinations in comparison with the corresponding urban stratum



Lao nationality
Literate people





Proportion (%)
Variance*
Proportion (%)
Variance*

Central zone
27 villages
89.9
0.00424
77.7
0.00118

9 selected villages
89.4
0.00441
76.4
0.00117
First urbanised belt
67 villages
98.3
0.00050
79.1
0.00198

9 selected villages
98.1
0.00040
77.4
0.00196
Second urbanised belt
56 villages
99.5
0.00012
73.8
0.00325

9 selected villages
99.7
0.00001
70.5
0.00341

* For 9 selected villages, variance corresponds to the mean difference (high squared) between the proportion in every 9 villages and the mean proportion calculated at the layer level.

Vallée et al. Emerging Themes in Epidemiology 2007 4:6   doi:10.1186/1742-7622-4-6