Table 4. Class Membership Comparisons 20s and 30s.

	20s Volume Class
30s Volume Class	Low Moderate	High Desisting	High Chronic	Total
Abstainer	9	4	0	13
% within 30s Abstainer class	69.2%	30.8%	0%	100%
% within 20s Volume class	27.3%	12.9%	0%	6.6%
Low Decreasing	15	18	57	90
% within 30s Low Decreasing class	16.7%	20.0%	63.3%	100%
% within 20s Volume class	45.5%	58.1%	42.9%	45.7%
High Increasing	9	9	76	94
% within 30s High Increasing class	9.6%	9.6%	80.9%	100%
% within 20s Volume class	27.3%	29.0%	57.1%	47.7%
Total	33	31	133	197
% within 30s Volume class	16.8%	15.7%	67.5%	100%
% within 20s Volume class	100%	100%	100%	100%
	20s HED Class
30s HED Class	Low Desisting	Moderate Desisting	Moderate Increasing	Total
No HED	83	12	2	97
% within 30s No HED class	85.6%	12.4%	2.1%	100%
% within 20s HED class	61.5%	32.4%	8.0%	49.2%
Low	43	16	8	67
% within 30s Low HED class	64.2%	23.9%	11.9%	100%
% within 20s HED class	31.9%	43.2%	32.0%	34.0%
High Decreasing	9	9	15	33
% within 30s High Decreasing HED class	27.3%	27.3%	45.5%	100%
% within 20s HED class	6.7%	24.3%	60.0%	16.8%
Total	135	37	25	197
% within 30s HED class	68.5%	18.8%	12.7%	100%
% within 20s HED class	100%	100%	100%	100%
	20s Problems Class
30s Problems Class	Low Desisting	High Desisting	Moderate Chronic	Total
No Problems	18	6	2	26
% within 30s No Problems class	69.2%	23.1%	7.7%	100%
% within 20s Problems class	38.3%	21.4%	1.6%	13.2%
Low Chronic	22	8	12	42
% within 30s Low Chronic Problems class	52.4%	19.0%	28.6%	100%
% within 20s Problems class	46.8%	28.6%	9.8%	21.3%
High Chronic	7	14	108	129
% within 30s High Chronic Problems class	5.4%	10.9%	83.7%	100%
% within 20s Problems class	14.9%	50.0%	88.5%	65.5%
Total	47	28	122	197
% within 30s Problems class	23.9%	14.2%	61.9%	100%
% within 20s Problems class	100%	100%	100%	100%

Note: Tabled numbers denote count (n) unless noted otherwise.