Incident cocaine outcomes from six years of the National Household Survey on Drug Abuse
| 1979 | 1988 | 1990 | 1991 | 1992 | 1993 | |
|---|---|---|---|---|---|---|
| First had opportunity to use cocaine during past five years | ||||||
| % Of respondents who answered affirmatively | 15.6 | 12.9 | 12.3 | 10.3 | 9.2 | 8.0 |
| Number of respondents analysed | 5420 | 7153 | 7116 | 23521 | 19743 | 18439 |
| Number of neighbourhoods analysed | 489 | 1505 | 1130 | 3424 | 3138 | 3018 |
| Number of cities analysed | 111 | 100 | 100 | 125 | 118 | 117 |
| First used cocaine during past five years | ||||||
| % Of respondents who answered affirmatively | 8.4 | 4.5 | 4.4 | 3.7 | 3.2 | 2.8 |
| Number of respondents analysed | 5747 | 7662 | 7958 | 26297 | 22170 | 20823 |
| Number of neighbourhoods analysed | 490 | 1518 | 1135 | 3441 | 3159 | 3042 |
| Number of cities analysed | 111 | 100 | 100 | 125 | 118 | 117 |