Table 2.

The HR and 95% CI from the Cox regression model of risk factors for hospitalised sickle cell disease records, 2012–2017

Variables	HR	95% CI	P value
Calendar-year (years)	0.99	0.99 to 1.00	0.151
Age group (years)
0–4	ref
5–9	0.99	0.94 to 1.05	0.830
10–14	1.08	1.01 to 1.14	0.018
15–19	1.17	1.10 to 1.24	<0.001
20–24	1.18	1.11 to 1.26	<0.001
25–29	1.27	1.17 to 1.37	<0.001
30–34	1.21	1.09 to 1.34	<0.001
35–39	1.08	0.93 to 1.24	0.301
40–44	1.20	1.01 to 1.41	0.036
45–49	1.36	1.15 to 1.62	<0.001
50–100	1.11	0.98 to 1.26	0.107
Sex
Male	ref
Female	1.03	0.98 to 1.10	0.259
Region
Greater Accra	ref
Ashanti	1.16	1.10 to 1.23	<0.001
Brong Ahafo	0.96	0.92 to 1.01	0.099
Central	0.99	0.94 to 1.05	0.797
Eastern	0.93	0.89 to 0.97	0.001
Northern	0.91	0.85 to 0.98	0.017
Upper East	1.14	1.03 to 1.26	0.009
Upper West	1.14	1.03 to 1.28	0.016
Volta	0.92	0.88 to 0.96	<0.001
Western	1.07	1.02 to 1.13	0.007
Employment status
Unemployed	ref
Employed	1.01	0.96 to 1.05	0.759
Unspecified	0.97	0.93 to 1.02	0.271
Education level
No formal education	ref
Formal education	1.01	0.98 to 1.04	0.523
Health insurance ownership
No	ref
Yes	0.98	0.95 to 1.02	0.366
Surgical procedure on admission
No	ref
Yes	0.78	0.69 to 0.87	<0.001
Comorbidity
No	ref
Yes	0.88	0.86 to 0.90	<0.001
Age and sex interaction
0–4 years#Female	ref
5–9 years#Female	1.02	0.94 to 1.11	0.568
10–14 years#Female	0.99	0.91 to 1.08	0.894
15–19 years#Female	1.03	0.95 to 1.12	0.406
20–24 years#Female	0.96	0.88 to 1.05	0.396
25–29 years#Female	0.88	0.80 to 0.98	0.017
30–34 years#Female	0.90	0.79 to 1.03	0.116
35–39 years#Female	0.96	0.81 to 1.14	0.653
40–44 years#Female	0.93	0.76 to 1.14	0.489
45–49 years#Female	0.88	0.70 to 1.10	0.251
50–100 years#Female	0.89	0.76 to 1.04	0.148