Table 1.

Incidence density (ID) and recurrence density (RD) of sickness absence (SA) per 1,000 employee-years according to ICD-10 category

Sickness absence diagnosis	ICD-10 codes	N	ID (99% CI)	N	RD (99% CI)
Diseases of the musculoskeletal system	M00–M99	12,129	46.3 (45.3–47.2)	4,023	118.7 (113.8–123.5)
Mental & behavioral disorders	F00–F99	7,197	27.7 (27.0–28.4)	1,400	80.4 (74.9–86.0)
Diseases of the respiratory system	J00–J99	4,568	23.3 (22.6–24.0)	788	74.6 (67.8–81.5)
Injury & poisoning	S00–T98	4,555	19.6 (19.0–20.2)	480	41.9 (37.0–46.8)
Disease of the digestive system	K00–K93	1,920	10.4 (10.0–10.8)	215	47.5 (39.2–55.9)
Diseases of the nervous system & sensory organs	G00–H95	1,559	8.0 (7.6–8.4)	201	51.9 (42.4–61.3)
Diseases of the circulatory system	I00–I99	1,356	6.9 (6.5–7.2)	182	52.9 (42.8–63.0)
Diseases of the genitourinary system	N00–N99	991	5.2 (4.9–5.5)	95	38.8 (28.5–49.0)
Neoplasms	C00–D48	618	2.8 (2.6–3.1)	53	42.0 (27.1–56.8)
Infectious & parasitic diseases	A00–B99	566	2.5 (2.3–2.8)	13	9.6 (2.7–16.5)
Diseases of the skin & subcutaneous tissues	D50–D89	501	2.7 (2.5–3.0)	45	35.5 (21.8–49.1)
Endocrine & metabolic diseases	E00–E90	270	1.3 (1.2–1.5)	43	61.2 (37.1–85.3)
Disease of blood & blood forming organs	L00–L99	112	0.6 (0.5–0.7)	4	14.2 (0.0–32.5)
Total		36,342	101.6 (100.2–102.9)	7,542	81.6 (79.1–84.0)

CI confidence interval