Table 3.

Categories of change countermeasures to be changed, the type of change, and the phase of each

First category	Type of change	First wave	Second wave	Third wave	Forth wave	Fifth wave	Sixth wave	Total
Basic system	Strengthen						3	3
	Neither	2	1				1	4
Occupational health service	Strengthen	5	1		1	1		8
Workplace countermeasures	Strengthen	27	19	16	5	12	8	87
	Mitigation	2	7	10	9	12	3	43
	Neither	6	2	1	2	3	3	17
Vaccine	Strengthen				3	4	1	8
	Mitigation				2			2
Incident	Strengthen	5			1	2	1	9
	Mitigation	5	5	8	1	19	27	65
	Neither	4				3	1	8
Total (type)	Strengthen	37	20	16	10	19	13	115
	Mitigation	7	12	18	12	31	30	110
	Neither	12	3	1	2	6	5	29
Total		56	35	35	24	56	48	254