Cluster wise distribution of districts is given in Table 2.
Reported asthma prevalence by school district ranged from 2.7 to 16.2%, with a median district asthma prevalence of 8.8%. Figure 1 presents the frequency distribution of district-wide reported asthma prevalence figures.
In a complementary analysis, the distribution of districts in both samples was not different (P=0.22, data not shown).
The ethnic distribution of the district comprised 74.2% Sinhalese, 12.7% Tamils, 12.3% Muslims and 0.8% others.
As the age distribution was not available at the village level, we applied the age distribution of the district to calculate the age-group specific attack rates in affected and unaffected areas.
The overall seroprevalence of HSV-2 and syphilis adjusted for the age, sex and rural-urban distribution of Guntur district population was 5.87% (95% CI, 4.28-7.46) and 1.75% (95% CI, 1.33-2.17), respectively.
To assure even distribution of the districts regarding population characteristics (urban, rural, mixed) and size, the districts were randomised as matched pairs.
The distribution of electoral districts was highly disproportionate," says Mr Navracsics, adding that population differences between districts are now smaller than 3%.
Figure 9 shows the distribution of priority districts on a background of poorly performing and better performing provinces.
Therefore, the distribution of sex, districts, age (data not shown) in the representative Beijing strains was similar to that in the total collection of 819 Beijing strains (P>0.05).
