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Table 1 Distribution of predictor variables according to having filled prescriptions for anti-asthma medication between 2007 and 2015

From: A longitudinal study of cannabis use increasing the use of asthma medication in young Norwegian adults

  No prescriptions At least one prescription Difference test Test statistics/p-value
Gender
 Men N (%) 1076 94.0 69 6.0   
 Women N (%) 1307 89.7 150 10.3 15.16 <.001
Age Mean (SD) 28.49 1.96 28.41 2.21 0.60 .551
Education (in years) Mean (SD) 14.96 2.17 14.88 2.11 0.50 .615
Body mass index Mean (SD) 24.36 4.04 24.60 4.34 0.80 .423
Asthma at T1
 No asthma N (%) 2155 92.3 179 7.7   
 Asthma N (%) 125 82.2 27 17.8 19.13 <.001
Allergies at T1
 No allergies N (%) 1817 92.5 147 7.5   
 Allergies N (%) 463 88.7 59 11.3 7.91 .005
Smoking at T4
 Has never smoked N (%) 1315 92.9 100 7.1   
 Smoked daily before, but not now N (%) 340 89.9 38 10.1   
 Smokes sometimes, but not daily N (%) 261 92.9 20 7.1   
 Smokes daily N (%) 457 88.4 60 11.6 12.10 .007
Cannabis use at T4
 Never used cannabis N (%) 1569 92.0 137 8.0   
 Has use cannabis before, but not last year N (%) 483 93.2 35 6.8   
 Used cannabis last year N (%) 277 87.4 40 12.6 9.50 .009
  1. at-values for continous variables; χ2-values for categorical variables
  2. Outcome measures are register data from the Norwegian Prescription Database and explanatory variables are taken from the longitudinal Young in Norway Study