Table 9. Table of contingency (the elements represent the number of serious accidents that happened during particular tasks of the accident event).

	Type of harm-causing event
Executed task	Z1	Z2	Z3	Z4	Z5	Z6	Z9	Total for tasks
M11	3	1	8	0	2	17	7	14
M12	8	1	18	7	5	40	3	41
M13	186	74	149	51	35	103	20	213
M2	28	13	45	8	9	90	8	51
M3	6	2	12	2	6	22	9	8
M8	1	2	8	2	5	14	4	12
M9	0	0	4	1	0	3	1	6
Total for events	232	93	244	71	62	289	52	345