Table 1: Selected demographic characteristics of study populations from four data sets

From: Cigarette smoking and the oral microbiome in a large study of American adults

 Never smokersFormer smokersCurrent smokersP-value
CPS-II-a (n=203)n=77n=103n=23 
 Age, mean (s.d.)70.53 (6.15)70.71 (6.23)68.82 (6.91)0.34a
 Sex, n (%)   0.02b
  Male47 (61.04)82 (79.61)16 (69.57) 
  Female30 (38.96)21 (20.39)7 (30.43) 
 Race, n (%)   NA
  White77 (100)103 (100)23 (100) 
  Non-White000 
 BMI (kg m−2), n (%)   0.57c
  Under weight (<18.5)1 (1.30)1 (0.97)0 
  Normal weight (18.5–25)29 (37.66)38 (36.89)7 (30.43) 
  Overweight (25–30)33 (42.86)37 (35.92)6 (26.09) 
  Obese weight (>30)10 (12.99)21 (20.39)3 (13.04) 
  Missing4 (5.19)6 (5.83)7 (30.43) 
     
CPS-II-b (n=340)n=150n=177n=13 
 Age, mean (s.d.)74.80 (5.81)72.97 (5.34)70.77 (6.66)1.40E−4a
 Sex, n (%)   1.00E−4b
  Male60 (40.00)112 (63.28)8 (61.54) 
  Female90 (60.00)65 (36.72)5 (38.46) 
 Race, n (%)   0.42c
  White142 (94.67)171 (96.61)12 (92.31) 
  Non-White8 (5.33)6 (3.39)1 (7.69) 
 BMI (kg m−2), n (%)   0.02c
  Under weight (<18.5)5 (3.33)1 (0.56)1 (7.69) 
  Normal weight (18.5–25)60 (40.00)64 (36.16)8 (61.54) 
  Overweight (25–30)57 (38.00)81 (45.76)1 (7.69) 
  Obese weight (>30)26 (17.33)27 (15.25)3 (23.08) 
  Missing2 (1.33)4 (2.26)0 
     
PLCO-a (n=261)n=100n=126n=35 
 Age, mean (s.d.)63.45 (5.29)63.71 (5.10)60.77 (4.66)0.01a
 Sex, n (%)   2.00E−4b
  Male63 (63.00)107 (84.92)30 (85.7) 
  Female37 (37.00)19 (15.08)5 (14.3) 
 Race, n (%)   0.51c
  White96 (96.00)119 (94.44)32 (91.4) 
  Non-White4 (4.00)5 (5.56)3 (8.5) 
 BMI (kg m−2), n (%)   0.33c
  Under weight (<18.5)1 (1.00)00 
  Normal weight (18.5–25)36 (36.00)36 (28.57)17 (48.57) 
  Over weight (25–30)45 (45.00)58 (46.03)14 (40.00) 
  Obese weight (>30)18 (18.00)27 (21.43)4 (11.43) 
  Missing04 (3.97)0 
     
PLCO-b (n=400)n=194n=165n=41 
 Age, mean (s.d.)64.25 (5.24)63.98 (5.32)61.02 (4.7)2.00E−3a
 Sex, n (%)   2.00E−3b
  Male102 (47.42)109 (66.06)32 (78.05) 
  Female92 (52.58)56 (33.94)9 (21.95) 
 Race, n (%)   0.04b
  White179 (92.27)153 (92.73)33 (80.49) 
  Non-White15 (7.73)12 (7.27)8 (19.51) 
 BMI (kg m−2), n (%)   0.29c
  Under weight (<18.5)1 (0.52)2 (1.21)0 
  Normal weight (18.5–25)68 (35.05)41 (24.85)16 (39.02) 
  Over weight (25–30)77 (39.69)69 (41.82)15 (36.59) 
  Obese weight (>30)45 (23.2)50 (30.30)9 (21.95) 
  Missing3 (1.55)3 (1.82)1 (2.44) 
  1. aP-values are based on ANOVA test.
  2. bP-values are based on Chi-square test.
  3. cP-values are based on Fisher's exact test.