Table 4.

Comparing means, standard deviations, and confidence intervals of different quartiles of age of onset with severity of alcoholism

Age of onset	Number	Mean	Std. deviation	95% CI
Less than 18 years	63	45.89	10.044	43.36 to 48.42
19–20 years	43	42.74	12.679	38.84 to 46.65
21–25 years	62	42.16	9.867	39.66 to 44.67
>26 years	32	35.69	12.180	31.30 to 40.08