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Age at initiation of drug use for 627 study participants, by gender.
| Study participant age | Men, median years (IQR) (n = 524) | Women, median years (IQR) (n = 103) | P |
|---|---|---|---|
| At first use of cocaine | 21 (18−21) | 23 (19−28) | .185 |
| At first use of heroin | 18 (16−21) | 20 (16−27.8) | .002 |
| At first use of crack cocaine | 40 (35−45) | 37 (33−43) | .020 |
| At first use of speedball | 21.5 (18−28) | 25 (20−32) | .017 |
| At first use of injection drugs | 18 (16−22) | 20 (17.8−26.3) | .003 |
NOTE. IQR, interquartile range.
