Table 2

Chi square test statistics and significant for paired year comparisons in incidence and prevalence

Comparison	Incidence				Prevalence
	Dependence		Hazardous		Dependence		Hazardous
	χ²	P value	χ²	P value	χ²	P value	χ²	P value
2017 versus 2018	80.77	0.0001↓	48.07	0.0001↓	3.68	0.06	0.45	0.50
2017 versus 2019	134.70	0.0001↓	75.79	0.0001↓	5.13	0.02↑	0.09	0.76
2017 versus 2020	261.06	0.0001↓	174.71	0.0001↓	0.21	0.64	15.75	0.00↓
2017 versus 2021	247.32	0.0001↓	115.63	0.0001↓	0.00	1.00	0.00	0.98
2018 versus 2019	7.40	0.007↓	3.25	0.07	0.12	0.73	0.14	0.71
2018 versus 2020	57.80	0.0001↓	41.87	0.0001↓	5.67	0.02↓	10.88	0.001↓
2018 versus 2021	50.85	0.0001↓	15.27	0.0001↓	3.68	0.06	0.48	0.49
2019 versus 2020	24.36	0.0001↓	21.97	0.0001↓	0.12	0.73	13.46	0.0002↓
2019 versus 2021	19.85	0.0001↓	4.4	0.04↓	5.13	0.02↓	0.10	0.75
2020 versus 2021	0.23	0.63	6.70	0.001↑	0.21	0.64	15.93	0.0001↑

Arrows in the table indicate direction (increase or decrease) of significant change from the previous year.