Table 10. Table of contingency (the elements represent the number of minor accidents that happened during particular tasks and the type of injury-causing event).

	Event
Executed task	Z1	Z2	Z3	Z4	Z5	Z6	Z9	Total for tasks
M11	1	2	1	0	3	5	2	14
M12	3	4	4	0	3	25	2	41
M13	57	29	45	6	32	26	18	213
M2	3	6	11	4	2	23	2	51
M3	0	1	3	0	1	1	2	8
M8	1	0	1	0	2	4	4	12
M9	0	0	4	0	1	1	0	6
Total for events	65	42	69	10	44	85	30	345