Table 2.

Difference on the mean severity scores with the subjects divided into two groups based on each of the two variables, Family History of Alcoholism (Dichotomy) and Age of Onset of initiation (Dichotomy)

Variables	n	Severity Scores Mean (sd)	Significance (P value)
Family history
Positive	123	44.59 (10.79)	0.001
Negative	77	38.96 (11.50)
Age of onset of initiation
Early onset (≤ 25 years)	168	43.71 (10.78)	0.001
Late onset (≥ 26years)	32	35.69 (12.18)

Independent sample t test was used. n = numbers; sd = standard deviation