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Table 1 Selected Charcteristics of the Study Participants by Cannabis Use Status. Data for the US NHANES, 2005–2016

From: Total and differential white blood cell count in cannabis users: results from the cross-sectional National Health and Nutrition Examination Survey, 2005–2016

Cannabis use status Never
(n = 7649)
Former
(n = 6608)
Occasional
(n = 1109)
Heavy
(n = 1064)
p-valuea
Selected charcteristics Mean (SE) or unweighted n (weighted column%)b
Age (years) 40 (0.2) 41 (0.2) 35 (0.6) 35 (0.6) < 0.0001
Female 4302 (55%) 3055 (47%) 450 (39%) 327 (32%) < 0.0001
Race/ethnicity
 White 2255 (55%) 3510 (76%) 501 (66%) 530 (70%) < 0.0001
 Black 1346 (11%) 1376 (10%) 329 (17%) 298 (15%)  
 Hispanic 2940 (24%) 1270 (10%) 194 (12%) 159 (10%)  
 All others 1108 (11%) 452 (4%) 85 (6%) 77 (5%)  
Education
  < high school 1984 (18%) 1027 (11%) 234 (16%) 256 (20%) < 0.0001
 High school 1540 (20%) 1491 (21%) 291 (25%) 305 (27%)  
  > high school 4125 (62%) 4090 (68%) 584 (59%) 503 (53%)  
Tobacco cigarette smoking
 Never 6012 (81%) 2920 (45%) 376 (33%) 228 (21%) < 0.0001
 Former 823 (10%) 1747 (29%) 174 (20%) 189 (21%)  
 Occasional 213 (2%) 380 (5%) 108 (10%) 104 (9%)  
 Daily 601 (7%) 1561 (21%) 451 (37%) 543 (48%)  
Alcohol drinking
 Non-drinker 2872 (34%) 1124 (15%) 76 (6%) 97 (8%) < 0.0001
 Occasional 4460 (64%) 5231 (81%) 970 (88%) 902 (85%)  
 Daily 117 (2%) 253 (4%) 63 (6%) 65 (7%)  
Survey cycle
 2005–06 1010 (16%) 1035 (17%) 143 (15%) 124 (15%) 0.05
 2007–08 1239 (16%) 1234 (18%) 173 (15%) 153 (13%)  
 2009–10 1453 (17%) 1176 (16%) 202 (16%) 200 (16%)  
 2011–12 1236 (16%) 1069 (17%) 177 (17%) 181 (17%)  
 2013–14 1337 (17%) 1155 (17%) 216 (17%) 208 (19%)  
 2015–16 1374 (18%) 939 (15%) 198 (20%) 198 (21%)  
BMI (Kg/m2) 29 (0.1) 29 (0.1) 27 (0.2) 27 (0.2) < 0.0001
  1. a P-value for global test: ANOVA for continuous variables and Pearson χ2 tests for categorical variables
  2. b Percentages may not add up to 100% due to rounding