2.3. Statistical Analysis
REGRESSION
A statistical computer package NCSS 2000 (Hintze JL, Kayswille, UT, USA) was used to analyze the data which is presented as mean and standard deviation (SD). The Kolmogorov–Smirnov test was used to assess the normality of data and parametric tests and nonparametric analyses were used where appropriate. The results reported here include a final sample of 79 adolescents (38 girls and 41 boys). One participant was excluded due to incomplete urine sample collection for the DLW protocol and another four participants since their post-dose urine sample enrichments were lower compared to the baseline enrichment for The male and female participants were listed by age in ascending order and every third participant was recruited into the cross-validation group (The PAEE prediction equation was developed using stepwise multiple regression analysis with PAEEThe final prediction equation was constructed after combining the validation and cross-validation groups (