Table 5.

Prevalence of BD in Monchegorsk, stratified by time-periods

Prevalence 1	73-82	83-92	93-02	03-11	p-value for trend
Total perinatal prevalence	23.5	40.5	38.7	46.3	<0.0001
	(20.4-26.6)	(36.7-44.3)	(33.7-43.7)	(40.7-51.9)
Prevalence by EUROCAT guideline	17.7	26.0	31.1	37.8	<0.0001
	(15.0-20.4)	(22.9-29.1)	(26.6-35.6)	(32.7-42.9)
Mandatory BD (22 forms)	4.8	7.6	11.3	6.9	0.11
	(3.4-6.3)	(5.9-9.3)	(8.6-14.1)	(4.7-9.1)

¹Per 1000 newborns (LB plus SB) with the 95% CI presented in parentheses.