TABLE 4.

Years of methamphetamine use by age.

AGE	MEAN (SD*)	TRIMMED MEAN (MOST EXTREME 10% REMOVED)	MAXIMUM†
35 Y or Younger (n = 110)	5.78 (4.10)	5.3	18.0
Years of smoking methamphetamine	3.69 (3.86)	3.1	17.0
Years of injecting methamphetamine	0.64 (2.02)	0.1	11.5
Years of snorting methamphetamine	1.35 (2.90)	0.6	17.0
Years of other method of using methamphetamine	0.10 (0.70)	0	6.7
36 to 54 Y (n = 410)	10.88 (7.90)	10.0	38.5
Years of smoking methamphetamine	6.51 (6.95)	5.4	33.0
Years of injecting methamphetamine	1.23 (4.20)	0.1	33.3
Years of snorting methamphetamine	2.80 (6.10)	1.2	38.5
Years of other method of using methamphetamine	0.30 (2.53)	0	29.5
55 Y or Older (n = 53)	12.79 (10.40)	11.6	46.8
Years of smoking methamphetamine	7.35 (8.90)	5.9	30.0
Years of injecting methamphetamine	1.90 (5.97)	0.3	38.7
Years of snorting methamphetamine	2.80 (6.40)	1.1	25.0
Years of other method of using methamphetamine	0.80 (4.40)	0	31.0

^*SD: Standard deviation.

^†Maximum value in sample.