Table 1:
Descriptive information on the participating discovery cohorts.
| Cohort | N (or range) | % Females | %Uncensored Observations | Mean age (SD) | Mean age at first use (sd) (in users) | Number of SNPs |
|---|---|---|---|---|---|---|
| Discovery | ||||||
| ALSPAC | 6147 | 51.9 | 38.4 | 17.3 (1.7) | 14.8 (1.6) | 6,284,747 |
| BLTS | 721 | 57.1 | 59.5 | 26.2 (3.3) | 18.8(2.8) | 4,093,835 |
| FinnTwin | 1029 | 51.7 | 27.5 | 22.8 (1.3) | 18.0 (2.5) | 4,362,100 |
| HUVH | 581 | 31.3 | 30.3 | 28.7 (12.5) | 16.0 (3.0) | 4,319,651 |
| NTR | 5148 | 62.3 | 16.6 | 46.9 (17.5) | 18.9 (5.1) | 4,773,834 |
| QIMR | 6758 | 53.8 | 51.3 | 45.2 (10.9) | 19.9 (5.8) | 5,953,917 |
| TRAILS | 1249 | 53.8 | 61.7 | 20.0 (1.6) | 16.3 (2.0) | 4,819,504 |
| Utrecht | 958 | 51.3 | 59 | 17.4 (3.2) | 15.5 (2.1) | 4,139,839 |
| Yale-Penn | 2362 | 41.2 | 92.6 | 38.2 (10.6) | 17.0 (9.4) | 5,732,659 |
N = sample size (or range if sample size varied across SNPs), % uncensored observations (i.e., individuals who have initiated cannabis use). Mean age: age when completing survey or interview. Mean age at first use: mean age at first cannabis use.