Table 4. Distribution of mean and standard deviation of quality-of-life scores among drug users by drug type (Herat, 2019) .

Type of drug	Drug user										P a
	Heroin (n=111)		Opium (n=58)		Crack (n=22)		Methamphetamine (n=42)		Hashish (n=7)
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
SF-36 (Quality of Life)
Physical functioning	88.23	22.56	97.63	5.83	78.69	25.49	85.71	22.69	75.89	28.28	0.002*
RLPH	79.73	36.85	90.09	22.91	77.27	38.51	72.62	38.18	67.86	47.25	0.166
General health	73.35	24.12	77.73	19.08	63.26	27.05	73.02	27.66	78.57	28.41	0.265
Bodily pain	75.92	28.12	83.62	23.50	64.32	29.73	69.35	29.79	72.86	23.11	0.038*
Mental health	75.32	23.95	77.13	19.67	65.76	25.05	77.94	18.12	72.38	26.23	0.304
Vitality	75.32	27.76	82.41	19.40	58.64	34.54	66.43	32.30	60.00	41.63	0.042*
RLEP	74.77	41.73	80.46	38.00	69.70	45.90	68.25	45.35	71.43	48.80	0.655
Social functioning	71.40	27.04	81.68	21.23	62.50	27.28	71.73	26.20	78.57	21.30	0.046*
PCS	79.31	22.34	87.27	13.05	70.89	22.99	75.17	25.55	73.79	29.23	0.066
MCS	74.20	24.40	80.42	19.17	64.15	23.09	71.09	23.79	70.60	26.91	0.064

PCS, Physical Component Subscale; MCS, Mental Component Subscale; RLPH, Role limitations due to physical health problems; RLEP, Role limitations due to emotional problems.

^aKruskal-Wallis test.

*P<0.05 is significant