Table 3 The prevalence of self-reported health problems and characteristics of the distribution of the number of days on sick leave by gender, occupational grade and age

Gender	Age (years)	Subjects, n	Health problems ()		with zero days	Days on sick leave
Gender	Age (years)	Subjects, n	One	Two or more	with zero days	Median	Upper quartile	Maximum	Mean of all values	Mean of non-zero values
Male blue-collar	1839	285	15	14	25	5	13	229	13	17
	4049	266	18	15	34	3	13	180	11	17
	5061	278	25	32	35	4	17	221	16	24
Male white-collar	1839	98	12	4	71	0	2	40	2	8
	4049	123	6	5	74	0	1	34	1	6
	5061	124	15	14	73	0	1	197	5	17
Female white-collar	1839	54	11	2	39	2	6	27	4	6
	4049	58	12	3	55	0	2	135	6	13
	5061	46	15	7	50	0	4	11	2	5
All eligible participants		1341	16	15	42	2	9	229	10	17
All respondents		1366	17	14	44	2	9	347	11	18
Non-respondents		1714	NA	NA	38	3	10	276	12	20

The data for blue-collar females are not shown due to small number of subjects (n9), but their data are included in All eligible participants.
Includes (in addition to the eligible participants of the study) those who were excluded from the analyses due to granted pension.
Includes all subjects who did not respond to the survey, or refused to participate in any part of the study. Their sickness absence data were gathered in an anonymous manner.