Table 4.

Factors related to long-term use of CSs [results of multiple logistic regression analysis] [Objective B]

		Odds ratio [95% CI]	p value
Sex	Male	1.22 [0.95, 1.58]	0.117
	Female	Reference
Age, years	<20a	Reference
	≥20, <40	1.10 [0.69, 1.76]	0.699
	≥40, <60	1.42 [0.89, 2.25]	0.142
	≥60	2.20 [1.19, 4.07]	0.012
Initial CS dose, mg/day	<10	5.94 [4.15, 8.50]	<0.001
	≥10, <20	2.23 [1.61, 3.11]	<0.001
	≥20, <30	1.32 [0.95, 1.83]	0.102
	≥30	Reference
With re-administration of CSs		0.98 [0.75, 1.27]	0.854
Without re-administration of CSs		Reference
Thiopurine non-user		0.46 [0.35, 0.61]	<0.001
Thiopurine user		Reference
Biologics non-user		0.57 [0.41, 0.80]	0.001
Biologics user		Reference
Medical institution visited on the index date	University hospital	1.06 [0.72, 1.55]	0.767
	National/public	1.68 [1.13, 2.50]	0.010
	Clinic [<20 beds]	Reference
	Other hospitalb	1.09 [0.80, 1.48]	0.581

Abbreviations: CI, confidence interval; CS, corticosteroid.

^aAmong the 103 [8.4%] patients aged <20 years, 39 [3.2%] were aged <16 years.

^bHospital with ≥20 beds other than a university hospital or national/public hospital.