Table 2.

Sequential models of DSM-IV criteria for males and females among new tobacco users by Wave 5 (N=350)

		Male (N=150)	Female (N=200)
Models	df	${\chi }_{\mathit{LR}}^2$	${\chi }_{\mathit{LR}}^2$
Model 0 (independence model)	60	194.73	234.98
Models 1- Tolerance or impaired control before withdrawal
1A. Tolerance or impaired control before withdrawal	16	19.05	12.30
1B. Tolerance before withdrawal	25	26.62	22.50
1C. Impaired control before withdrawal	25	30.85	19.82
1D. Tolerance and impaired control before withdrawal	34	38.19	30.85
Models 2- Tolerance or impaired control before attempts to quit
2A. Tolerance or impaired control before attempts to quit	16	5.99	10.40
2B. Tolerance before attempts to quit	25	14.36	28.04
2C. Impaired control before attempts to quit	25	11.02	14.82
2D. Tolerance and impaired control before attempts to quit	34	18.52	31.27
Models 3- Combined best fitting models of Models 1 and 2
3A. (1D+2D) Tolerance and impaired control before   withdrawal and attempts to quit	47	48.19	55.49
3B. (1D+2C) Tolerance and impaired control before   withdrawal, impaired control before attempts to quit	44		37.45
Models 4- Modifications of Model 2D for males and Model 3B for females in the order between withdrawal and attempts to quit
4A. Model 2D+ withdrawal before attempts to quit	38	22.54
4B. Model 2D+ attempts to quit before withdrawal	51	50.23
4C. Model 3B+ attempts to quit before withdrawal	48		43.25
Models 5- Modifications of Model 4A for males in the order between withdrawal and impaired control
5A. Model 4A+ withdrawal before impaired control	48	33.94
5B. Model 4A+ impaired control before withdrawal	48	46.85
Models 6- Modifications of Model 5A for males and Model 4C for females in the order between tolerance and impaired control
6A. Model 5A+ tolerance before impaired control	51	40.11
6B. Model 5A+ impaired control before tolerance	55	64.00
6C. Model 4C+ impaired control before tolerance	52		62.12
Models 7- Modifications of Model 6A for males in the order between tolerance and withdrawal
7A. Model 6A+ tolerance before withdrawal	55	49.22
7B. Model 6A+ withdrawal before tolerance	55	63.57