Table 3.

Number of participants who responded to the questions on level of occupational physical activity (OPA) at examinations 4 and 5.

Examination 4 (2001-2003)	Examination 5 (2011-2015)
	1a	2	3	4
1	523	163	30	1
2	175	352	73	3
3	43	112	219	13
4	7	13	13	22

^a1=predominantly sedentary; 2=sitting or standing, some walking; 3=walking, some handling of material; 4=heavy manual work.