TABLE 5.

Frequency of Normal and Preterm (<37 Weeks) Birth and Incidence (per 100 Live Births) of Preterm Birth by Water Service Category (January 2003 – August 2005)

Water Service Category	Normal Term Birth (≥37Weeks)	Preterm Birth (<37Weeks)	Incidence of Preterm Birth (95% CI)
LHWA Only	150	18	10.7 (6.47 – 16.4)
Partial LHWA	190	24	11.3 (7.4 – 16.4)
No LHWA	1017	158	13.4 (11.5 – 15.5)
TOTAL	1355	200	12.9 (11.2 – 14.6)

^*None of the incidence estimates of preterm birth for each Water Service Category are significantly different (p>0.05) from 12.7%, the national incidence of preterm birth [41]. Although not shown, no zip code in Washington County had an incidence of premature birth that was significantly greater than the national average.