Table 1 Distribution of study participants in relation to age in years
From: Impact of tramadol and heroin abuse on electroencephalography structure and cognitive functions
Age (years) | Tramadol group (n = 40) | Heroin group (n = 40) | Control group (n = 40) | P |
|---|---|---|---|---|
Range | 18–50 | 16–44 | 18–48 | 0.987 |
Mean + SD | 29.80 ± 9.55 | 29.90 ± 6.59 | 30.10 ± 8.68 |