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Table 1 Baseline characteristics among participants at baseline and follow-up, and those lost to follow-up

From: Predictors of smoking among Swedish adolescents

  Participants at baseline and follow-up Lost to follow-up Chi2
  n (%) n (%) P
Gender
Boys 292 (45.0) 187 (60.1)  
Girls 357 (55.0) 124 (39.9) <0.01
Age
12 years old 154 (23.8) 57 (18.4)  
13 years old 475 (73.5) 239 (77.3)  
14 years old 17 (2.6) 13 (4.2) 0.09
Country of birth
Born in Sweden 612 (94.4) 282 (91.0)  
Born outside Sweden 36 (5.6) 28 (9.0) 0.04
Residence
City/Town 350 (55.6) 180 (60.8)  
Village 160 (25.4) 64 (21.6)  
Rural area 120 (19.0) 52 (17.6) 0.30
Parental education
High 352 (54.7) 146 (47.9)  
Low 292 (45.3) 159 (52.1) 0.05
Mood in family
Good 572 (90.1) 270 (89.1)  
Not good 63 (9.9) 33 (10.9) 0.65
Self-rated health
High 333 (51.7) 156 (50.5)  
Medium 272 (42.2) 122 (39.5)  
Low 39 (6.1) 31 (10.0) 0.08
Self-esteem
High 362 (56.7) 194 (63.6)  
Medium 223 (35.0) 86 (28.2)  
Low 53 (8.3) 25 (8.2) 0.10
Attitudes towards smoking
Very negative 554 (86.2) 252 (81.8)  
Not very negative 89 (13.8) 56 (18.2) 0.08
Physical exercise
High 480 (77.4) 226 (75.6)  
Low 140 (22.6) 73 (24.4) 0.54
Binge drinking
No 595 (93.4) 274 (91.0)  
Once or more 42 (6.6) 27 (9.0) 0.19
Snus use
No 588 (91.9) 260 (86.4)  
Previous or current use 52 (8.1) 41 (13.6) 0.01
Smoking
No 618 (96.7) 286 (94.4)  
Yes 21 (3.3) 17 (5.6) 0.09