Table 2.

Examination year and cohort analysis of the DF presence in the study children, 2015 and 2018.

	Ratio	95% CI	P value	SGPV∗
Examination year
2015	1.00
2018	1.17	0.89, 1.55	0.261	0.21
Birth cohort
2000–2002	0.89	0.41, 1.94	0.767	0.574
2003–2005	1.03	0.68, 1.57	0.889	0.461
2006–2008	0.95	0.63, 1.44	0.804	0.559
2009–2011	1.00

^∗Second-generation P values.