Table 4.

FN stratified by age.

Age Group (Years)	n	Mean (%)	SD	Lower 95%CI	Upper 95%CI	p-Value
						vs. 20–29	vs. 30–39	vs. 40–49	vs. 50–59	vs. 60–69	vs. 70–79	vs. 80–89	vs. 90–99
10–19	63	5.30	8.54	3.15	7.45	1.0000	0.9990	0.9954	0.9763	0.9980	0.9918	0.0014 *	0.0066 *
20–29	86	5.74	12.45	3.07	8.41	-	0.9974	0.9889	0.9488	0.9942	0.9895	0.0004 *	0.0040 *
30–39	213	4.30	7.99	3.22	5.38	-	-	1.0000	0.9998	1.0000	0.0770	<0.0001 *	<0.0001 *
40–49	385	4.97	9.49	4.02	5.92	-	-	-	1.0000	1.0000	0.0013 *	<0.0001 *	<0.0001 *
50–59	820	4.12	7.15	3.63	4.61	-	-	-	-	0.9796	<0.0001 *	<0.0001 *	<0.0001 *
60–69	1695	4.53	7.85	4.16	4.90	-	-	-	-	-	<0.0001 *	<0.0001 *	<0.0001 *
70–79	2051	6.58	9.88	6.15	7.01	-	-	-	-	-	-	<0.0001 *	0.0010 *
80–89	900	10.00	11.47	9.25	10.75	-	-	-	-	-	-	-	0.9815
90–99	58	11.24	13.23	7.76	14.72	-	-	-	-	-	-	-	-

To adjust the multi-pair comparisons, the p values are calculated using the Tukey-Kramer’s HSD test between each pair of groups. * p < 0.05. SD, standard deviation; CI, confidence interval.