These 15 NCHMs provided a unique opportunity to investigate the issue of chlorination.
Characteristic 14 CHMs 14 NCHMs Total population (1989) 463,657 397,588 Mean population 28,399 33,118 Population density 611.
The mean birth weights in the CHMs and NCHMs were 3,181.
01%) Variables NCHMs Singleton live births(n) 8,018 Mean birth weight 3,170.
Table 3 shows the ORs for term LBW and preterm delivery based on comparisons between CHMs and NCHMs using logistic regression.
The percentage of the population served by chlorinated water in the CHMs and NCHMs was 96.