Table 3.

Cox regression

Parameter	Estimate (SE)	Z	Pr > Z	Hazard ratio (95% CI)
Age group (years)
≤ 60	− 0.11 (0.43)	− 0.25	0.80	0.90 (0.39–2.08)
61–70	− 0.21 (0.42)	− 0.51	0.61	0.81 (0.36–1.84)
> 70	Reference
Gender
Male	− 0.61 (0.18)	− 3.45	< 0.001	0.54 (0.39–0.77)
Female	Reference
CCI	− 0.12 (0.07)	− 1.60	0.11	0.89 (0.77–1.03)
Degree of polypharmacy
0	Reference
1–2	0.21 (0.27)	0.81	0.42	1.24 (0.74–2.09)
3–5	0.40 (0.31)	1.29	0.20	1.50 (0.81–2.77)
Insurance status
Full member	0.14 (0.34)	0.42	0.67	0.16 (0.59–2.26)
Pensioner	0.14 (0.41)	0.33	0.74	1.15 (0.51–2.57)
Unknown	–	–	–	–
Family-insured	Reference
Corticosteroid prescription
No	Reference
Yes	0.22 (0.17)	1.29	0.20	1.25 (0.89–1.76)
Psoriasis diagnosis in the same quarter as the index event
No	Reference
Yes	0.19 (0.22)	0.86	0.39	1.21 (0.78–1.88)

CCI Charlson Comorbidity Index, CI confidence interval, SE standard error