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Table 1 Sample characteristics (n = 640)

From: The potential impact of plain packaging of cigarette products among Brazilian young women: an experimental study

Characteristic Overall Branded Plain Plain - no descriptor (n = 218) Differences between groups
  (n = 640) (n = 214) (n = 208)   
Age
 Mean 22.4 22.4 22.4 22.4 F = 0.1
SD = 2.4 SD = 2.3 SD = 2.4 SD = 2.5 p = 0.905
Education level
 Low 21.9% (140) 18.8% (40) 21.6% (45) 25.1% (55) χ 2 = 3.3
 Moderate 48.3% (309) 48.8% (104) 50.5% (105) 45.7% (100) p = 0.512
 High 29.8% (191) 32.4% (69) 27.9% (58) 29.2% (64)  
Ethnicity*
 White 62.9% (401) 54.7% (116) 65.2% (135) 68.5% (150) χ 2 = 11.2
 “Pardo” 25.2% (161) 32.5% (69) 23.7% (49) 19.6% (43) p = 0.025
 Other 11.9% (76) 12.7% (27) 11.1% (23) 11.9% (26)  
Smoking status
 Smoker 28.4% (182) 28.2% (60) 27.9% (58) 29.2% (64) χ 2 = 0.1
 Non-smoker 71.6% (458) 71.8% (153) 72.1% (150) 70.8% (155) p = 0.949
Smoking frequency a
 Daily 39.0% (71) 43.3% (26) 41.4% (24) 32.8% (21) χ 2 = 2.0
 Weekly 24.2% (44) 20.0% (12) 24.1% (14) 28.1% (18) p = 0.732
 Monthly 36.8% (67) 36.7% (22) 34.5% (20) 39.1% (25)  
Cigarettes per day a
 Mean 10.8 9.8 10.5 12.3 F = 0.6
SD = 7.6 SD = 5.8 SD = 8.8 SD = 8.2 p = 0.537
Quit intentions a
 Within the next month 12.9% (18) 16.7% (8) 8.3% (4) 14.0% (6) χ 2 = 4.5
 Within the next 6 months 18.0% (25) 14.6% (7) 22.9% (11) 16.3% (7) p = 0.609
 Sometime in the future 53.2% (74) 47.9% (23) 58.3% (28) 53.5% (23)  
 Not planning to quit 15.8% (22) 20.8% (10) 10.4% (5) 16.3% (7)  
  1. SD, standard deviation.
  2. *Statistically significant difference between experimental conditions (p < 0.05).
  3. aAmong current smokers only.