Table 2.

Unadjusted costs by type of chronic inflammatory disease during the 12-month observation period

	Unadjusted all-cause costs per year, USD (2017), mean ± SD [median]
	Patients who developed IBD	Patients who did not develop IBD
All Patients: Patients with RA, PsO, PsA, or AS	N = 2778	N = 534,672
Total healthcare costs	41,150 ± 62,218 [23,482]	20,644 ± 39,510 [7867]
Medical costs	29,735 ± 59,281 [10,781]	13,004 ± 35,906 [3051]
Hospitalization costs	13,163 ± 48,359 [0]	4059 ± 23,848 [0]
Outpatient costs	14,595 ± 25,168 [6399]	8063 ± 21,660 [2426]
Emergency room costs	1836 ± 5954 [0]	771 ± 3706 [0]
Durable medical equipment costs	142 ± 716 [0]	112 ± 762 [0]
Pharmacy costs	11,414 ± 18,916 [3917]	7640 ± 15,353 [1462]
Patients with RA	N = 1082	N = 205,178
Total healthcare costs	50,861 ± 71,823 [32,696]	27,026 ± 43,583 [14,242]
Medical costs	38,597 ± 69,336 [15,748]	17,820 ± 40,349 [4836]
Hospitalization costs	17,888 ± 58,399 [0]	5530 ± 26,284 [0]
Outpatient costs	18,319 ± 26,492 [8400]	11,195 ± 24,592 [3651]
Emergency room costs	2200 ± 7188 [0]	950 ± 4371 [0]
Durable medical equipment costs	189 ± 894 [0]	144 ± 825 [0]
Pharmacy costs	12,264 ± 20,941 [4715]	9206 ± 16,335 [2184]
Patients with PsO and PsA	N = 106	N = 21,144
Total healthcare costs	50,162 ± 57,420 [35,973]	32,452 ± 38,332 [24,341]
Medical costs	30,747 ± 54,422 [11,781]	14,702 ± 32,814 [3508]
Hospitalization costs	9988 ± 42,153 [0]	3607 ± 19,405 [0]
Outpatient costs	19,042 ± 25,040 [7382]	10,236 ± 22,143 [2843]
Emergency room costs	1581 ± 4740 [0]	755 ± 3772 [0]
Durable medical equipment costs	136 ± 517 [0]	104 ± 763 [0]
Pharmacy costs	19,415 ± 22,960 [10,857]	17,750 ± 21,576 [8425]
Patients with PsO but without PsA	N = 490	N = 124,460
Total healthcare costs	35,062 ± 56,249 [17,763]	16,494 ± 36,155 [5807]
Medical costs	24,355 ± 52,492 [8468]	8902 ± 32,175 [2067]
Hospitalization costs	10,940 ± 42,213 [0]	2746 ± 22,967 [0]
Outpatient costs	11,646 ± 23,071 [5330]	5498 ± 18,670 [1681]
Emergency room costs	1665 ± 4635 [0]	568 ± 2858 [0]
Durable medical equipment costs	104 ± 564 [0]	89 ± 641 [0]
Pharmacy costs	10,708 ± 16,664 [3533]	7592 ± 15,405 [1326]
Patients with AS	N = 277	N = 15,752
Total healthcare costs	47,410 ± 53,738 [34,535]	28,325 ± 41,809 [17,443]
Medical costs	31,894 ± 53,244 [12,097]	16,045 ± 37,433 [3961]
Hospitalization costs	12,165 ± 42,744 [0]	4242 ± 22,895 [0]
Outpatient costs	17,493 ± 27,693 [6757]	10,861 ± 24,478 [3162]
Emergency room costs	2089 ± 6233 [0]	819 ± 3427 [0]
Durable medical equipment costs	147 ± 661 [0]	123 ± 944 [0]
Pharmacy costs	15,516 ± 18,356 [9058]	12,280 ± 19,354 [3021]
Patients with AS, PsA, or PsO	N = 982	N = 182,336
Total healthcare costs	42,074 ± 60,394 [25,759]	20,734 ± 37,661 [8332]
Medical costs	28,425 ± 57,753 [10,267]	10,858 ± 33,031 [2443]
Hospitalization costs	11,719 ± 47,236 [0]	3114 ± 22,291 [0]
Outpatient costs	14,843 ± 25,322 [6313]	7021 ± 20,265 [1998]
Emergency room costs	1747 ± 4986 [0]	628 ± 3091 [0]
Durable medical equipment costs	116 ± 565 [0]	95 ± 684 [0]
Pharmacy costs	13,649 ± 18,296 [5311]	9877 ± 17,339 [1846]

RA Rheumatoid arthritis, PsA Psoriatic arthritis, PsO Psoriasis, AS Ankylosing spondylitis, IBD Inflammatory bowel disease, USD US dollars