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Table 3 Descriptive statistics and X2 results for substance use in the HRGC and LRGC

From: Mental health of Covid-19 risk groups during the first Covid-19 lockdown in Germany: a cross-sectional study

Variable HRGC LRGC p-value Effect size
  N % N % X2 Phi
Substance use in the last 12 months
 Alcohol 1056 97.4 1151 93.4 .190  
 Nicotine 618 62.5 302 29.3 < .001 0.333
 THC 292 30.5 186 17.3 < .001 0.155
 Cocaine 56 5.3 23 1.9 < .001 0.093
 Amphetamines 69 6.5 29 2.4 < .001 0.101
 Methamphetamines 23 2.1 8 0.7 .002 0.064
 Ecstasy 65 6.2 33 2.7 < .001 0.084
Alcohol use during lockdown 1137   1259   .046 0.064
 No use 231 20.3 226 18.0   
 Less than before 187 16.4 210 16.7   
 No change 416 36.6 500 39.7   
 Slightly more than before 228 20.1 269 21.4   
 Significantly more than before 75 6.6 54 4.3   
Nicotine use during lockdown 1106   1177   < .001 0.391
 No use 529 47.8 988 83.9   
 Less than before 69 6.2 44 3.7   
 No change 286 25.9 100 8.5   
 Slightly more than before 160 14.5 32 2.7   
 Significantly more than before 62 5.6 13 1.1   
THC use during lockdown 1069   1185   < .001 0.148
 No use 859 80.4 1064 89.8   
 Less than before 39 3.6 28 2.4   
 No change 100 9.4 68 5.7   
 Slightly more than before 50 4.7 23 1.9   
 Significantly more than before 21 2.0 2 0.2