Table 2: Mean score of saying "no" skill in the intervention and control groups before, immediately and two months after the intervention.

Score of saying no skill Intervention Control
Mean Standard deviation Mean Standard deviation
Before intervention 1.7500 1.03120 2.0685 1.05842
immediately after the intervention 3.6944 0.49330 1.7534 0.98292
Two months after the intervention 3.5139 0.60498 2.0822 0.95384
p-value 0.000 0.009