Table 3.

Risks of first hospital admission according to ICD9–CM classification after date of diagnosis in CD subjects compared to matched references, stratified by first outcome occurrence (30–365 days after the index date/>365 days after the index date)^a

First outcome occurrence	30–365 days					>1 year after index dateb
ICD codes	REFERENCES		CD		HR (95 % CI)	REFERENCES		CD		HR (95 % CI)
	n	py	n	py		n	py	n	py
001–V89	281	5260	243	1095	4.28 (3.56–5.13)	964	27812	256	4820	1.58 (1.36–1.85)
001–139	18	5380	17	1221	4.38 (2.25–8.55)	55	35520	27	8176	2.23 (1.37–3.63)
140–239	8	5384	6	1226	2.88 (0.94–8.85)	6	35836	21	8459	1.72 (1.00–2.98)
240–279	12	5383	24	1216	8.37 (4.12–16.99)	84	35553	45	8112	2.42 (1.66–3.52)
280–289	7	5426	13	1309	--	16	35947	12	8392	2.70 (1.21–6.04)
290–319	12	5476	9	1272	--	48	35819	26	8394	2.26 (1.37–3.72)
320–389	32	5375	13	1224	1.83 (0.94–3.56)	82	35306	43	8190	2.26 (1.54–3.32)
390–459	2	5388	0	1229	--	27	36017	16	8537	2.99 (1.59–5.64)
460–519	66	5356	38	1213	2.62 (1.74–3.95)	281	32991	83	7550	1.34 (1.03–1.73)
520–579	30	5375	123	1156	18.96 (12.52–28.70)	190	34853	109	6690	3.07 (2.38–3.97)
580–629	23	5378	11	1226	1.92 (0.88–4.19)	71	35483	31	8307	1.95 (1.25–3.05)
630–679	1	5388	0	1229	--	45	36006	15	8578	1.57 (0.87–2.82)
680–709	6	5385	2	1228	0.81 (0.10–6.70)	49	35830	14	8493	1.27 (0.69–2.32)
710–739	12	5384	7	1226	2.32 (0.87–6.21)	92	35672	20	8490	0.70 (0.39–1.23)
740–779	21	5381	16	1220	3.39 (1.74–6.59)	69	35521	28	8262	1.80 (1.14–2.85)
780–799	16	5381	18	1220	5.43 (2.76–10.66)	67	35517	37	8193	2.33 (1.52–3.56)
800–999	1	5389	1	1229	5.00 (0.31–79.95)	166	36102	56	8611	1.33 (0.97–1.83)
V01–V89	15	5379	15	1223	4.18 (2.00–8.74)	43	35713	26	8245	2.50 (1.50–4.17)

Py person–years, CD celiac disease, HR Hazard Ratio, CI confidence interval, Figures in bold are statistically significant results (p-value <0.05)

^aMatched by year of birth, gender and maternal education; ^bexcluding subjects with less than one year of follow-up for each outcome