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Table 2 Principal component analysis of the LWDS-11 items among waterpipe smokers only (N = 449)

From: Lebanese Waterpipe Dependence Scale (LWDS-11) validation in a sample of Lebanese adolescents

LWDS-11 item Factor 1 h2
communalities
Item-total correlation*
LWDS 1. Number of times you could stop waterpipe for 7 days? 0.881 0.776 0.884
LWDS 2. Percent of income you would spend on waterpipe smoking? 0.667 0.445 0.665
LWDS 3. Number of days you could spend without waterpipe? 0.806 0.649 0.815
LWDS 4. Number of water pipes you usually smoke per week? 0.622 0.387 0.627
LWDS 5. You smoke waterpipe to relax your nerves. 0.848 0.719 0.853
LWDS 6. You smoke waterpipe to improve your morale. 0.843 0.710 0.847
LWDS 7. Do you smoke waterpipe when you are seriously ill? 0.917 0.841 0.909
LWDS 8. Do you smoke waterpipe alone? 0.888 0.789 0.882
LWDS 9. Are you ready not to eat in exchange for a waterpipe? 0.898 0.806 0.890
LWDS 10. You smoke waterpipe for pleasure. 0.884 0.782 0.885
LWDS 11. You smoke to please others (for conviviality) 0.919 0.845 0.911
Percentage of variance explained 70.45   
Cronbach’s alpha 0.96   
  1. *p < 0.001 for all correlations