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. Author manuscript; available in PMC: 2017 Aug 1.
Published in final edited form as: Am J Addict. 2016 Jul 15;25(5):400–407. doi: 10.1111/ajad.12403

TABLE 4.

Number of NPS and NPS classes used in relation to level of club attendance

Number of NPS
Number of NPS classes
Mean (median, IQR) mean (median, IQR)
Less than once a month 1.21 (0,1) 1.04 (0,1)
Once a month 1.87 (1,2) 1.68 (1,3)
Every other week 2.39 (1,3) 1.97 (1,3)
Every week 2.01 (1,3) 1.82 (1,3)
LR χ2 (3) =257.97, p <0.001 LR χ2 (3) =226.35, p <0.001