Table 5

Time trends in incidence stratified by age group

Age group	Variable	Estimate (95% CI of the estimate)	p Value
IBD
6 months–4 years	Year*	0.050 (0.0048 to 0.1051)	0.03
	Sex (M)	0.256 (0.0628 to 0.4499)	0.009
5–9 years	Year	0.076 (0.0436–0.1083)	<0.0001
	Sex (M)	0.091 (−0.026 to 0.209)	0.13
10–14 years	Year	0.0063 (−0.0086 to 0.0213)	0.41
	Sex (M)	0.1339 (0.0776 to 0.1903)	<0.0001
15–17 years	Year	−0.0021 (−0.013 to 0.009)	0.72
	Sex (M)	0.0174 (−0.025 to 0.0598)	0.42
CD
6 months–4 years	Year	0.009 (−0.048 to 0.066)	0.76
	Sex (M)	0.207 (−0.011 to 0.425)	0.06
5–9 years	Year	0.087 (0.047 to 0.127)	<0.0001
	Sex (M)	0.173 (0.027 to 0.320)	0.02
10–14 years	Year	0.006 (−0.008 to 0.020)	0.41
	Sex (M)	0.235 (0.182 to 0.289)	<0.0001
15–17 years	Year	−0.006 (−0.024 to 0.011)	0.47
	Sex (M)	0.048 (−0.017 to 0.114)	0.15
UC
6 months–4 years	Year	0.037 (−0.019 to 0.093)	0.20
	Sex (M)	0.207 (–0.012 to 0.425)	0.06
5–9 years	Year	0.045 (−0.007 to 0.098)	0.09
	Sex (M)	0.028 (−0.165 to 0.221)	0.78
10–14 years	Year	−0.027 (−0.060 to 0.007)	0.12
	Sex (M)	−0.047 (−0.173 to 0.079)	0.47
15–17 years	Year	−0.007 (−0.026 to 0.011)	0.45
	Sex (M)	−0.047 (−0.116 to 0.022)	0.18

*Year refers to the year of diagnosis.
CD, Crohn’s disease; IBD, inflammatory bowel disease; M, male; UC, ulcerative colitis.