Table 4.

Cumulative Rate of Low Birth Weight in Selected Counties During Periods 1, 2, and 3

	Cumulative Rate of LBW			P value (time)
	Period 1 (1986–1991)	Period 2 (1993–2001)	Period 3 (2005–2013)	P value (time)
Alabama^*	8.2	9.3	10.5
Pickens County	9.9^a	11.5^a	11.8^a	.09
Clarke + Monroe Counties	9.0^a	9.8^a	13.8^b	<.001
Coosa + Conecuh Counties	9.5^a	12.4^b	12.5^b	.001
P value (county)	.49	<.001	.053

Low birth weight (LBW) values with different superscript lowercase letters within each row differ significantly (P < .05).
↵* Mean rates.