Table 4 Adjusted cox models by time periods.

Both

2·02 (1·47-2·78)

< 0·0001

Stimulant use

1·05 (0·75-1·48)

0·7644

Opioid use

Both

2·16 (1·54-3·02)

< 0·0001

Stimulant use

1·11 (0·77-1·59)

0·5822

Opioid use

Both

2·26 (1·52-3·37)

< 0·0001

Stimulant use

0·99 (0·64-1·54)

0·9744

Opioid use

Both

2·60 (1·51-4·48)

0·0006

Stimulant use

1·20 (0·66-2·18)

0·5555

Opioid use