Table 2.

Hospitalisation rates for 160 patients with primary Sjögren syndrome and 466 comparators according to categorised primary discharge diagnoses, 1995–2016

Diagnosis category*	Patients with primary Sjögren’s syndrome (n=160; person-years=1592)		Comparators (n=466; person-years=4660)		Rate ratio (95% CIl)
	Number of hospitalisations	Rate per 100 person-years	Number of hospitalisations	Rate per 100 person-years
Overall	385	24.2	899	19.3	1.25 (1.11 to 1.41)
Infectious and parasitic diseases	12	0.8	30	0.6	1.20 (0.59 to 2.24)
Neoplasms	18	1.1	45	1.0	1.19 (0.67 to 1.99)
Endocrine, nutritional and metabolic diseases and immunity disorders	24	1.5	39	0.8	1.82 (1.08 to 2.98)
Mental illness	13	0.8	31	0.7	1.25 (0.63 to 2.30)
Diseases of the nervous system and sense organs	14	0.9	33	0.7	1.27 (0.65 to 2.28)
Diseases of the circulatory system	74	4.7	186	4.0	1.17 (0.89 to 1.52)
Diseases of the respiratory system	39	2.5	89	1.9	1.29 (0.87 to 1.86)
Diseases of the digestive system	28	1.8	94	2.0	0.88 (0.57 to 1.31)
Diseases of the genitourinary system	22	1.4	61	1.3	1.07 (0.64 to 1.70)
Complications of pregnancy; childbirth and the puerperium	9	0.6	20	0.4	1.36 (0.58 to  2.82)
Diseases of the skin and subcutaneous tissue	7	0.4	17	0.4	1.25 (0.48 to 2.80)
Connective tissue†	52	3.3	103	2.2	1.49 (1.05 to 2.05)
Injury and poisoning	45	2.8	91	2.0	1.46 (1.01 to 2.06)
Symptoms, signs and ill-defined conditions	20	1.3	42	0.9	1.41 (0.81 to 2.35)

*The following four categories with <5 hospitalisation in patients with primary Sjögren syndrome were excluded: diseases of the blood and blood-forming organs, congenital anomalies, certain conditions originating in the perinatal period, residual codes and unclassified.

†Two hospitalisations for Sicca syndrome were removed from diseases of the musculoskeletal system and connective tissue for comparability.