Table 1

Baseline and follow-up characteristics with differences on a basis of smoking status (MW—Mann-Whitney Z values; χ2 test)

BaselineFollow-up
SmokersNon-smokersMWSmokersNon-smokersMW
f (%)f (%)Z (p value)F (%)F (%)Z (p value)
Experience in sport1.54 (0.12)0.93 (0.34)
 Never been involved180 (28.8)56 (22.6)174 (31.3)62 (19.6)
 Less than a year132 (21.2)56 (22.6)104 (18.7)84 (26.6)
 2–5 years164 (26.3)72 (29)136 (24.5)100 (31.6)
 >5 years148 (23.7)64 (25.8)142 (25.5)70 (22.2)
Sport success/result2.34 (0.02)0.96 (0.33)
 Never competed344 (55.1)114 (46)308 (55.4)150 (47.5)
 Local rank230 (36.9)116 (46.8)204 (36.7)142 (44.9)
 National/international44 (7.1)18 (7.3)40 (7.2)22 (7)
Grade point average6.03 (0.01)6.36 (0.01)
 Excellent262 (42)66 (26.6)242 (43.5)86 (27.2)
 Very good246 (39.4)96 (38.7)222 (39.9)120 (38)
 Average106 (17)76 (30.6)86 (15.5)96 (30.4)
 Under average6 (1)4 (1.6)2 (0.4)8 (2.5)
 Poor4 (0.6)6 (2.4)4 (0.7)6 (1.9)
Behavioural grade7.76 (0.01)7.71 (0.01)
 Excellent538 (86.2)180 (72.6)500 (89.9)218 (69)
 Very good46 (7.4)26 (10.5)24 (4.3)48 (15.2)
 Average30 (4.8)28 (11.3)24 (4.3)34 (10.8)
 Under average6 (1)8 (3.2)6 (1.1)8 (2.5)
 Poor4 (0.6)6 (2.4)2 (0.4)8 (2.5)
School absence5.60 (0.01)9.30 (0.01)
 Almost never244 (39.1)52 (21)246 (44.2)50 (15.8)
 Rarely244 (39.1)102 (41.1)206 (37.1)140 (44.3)
 From time to time108 (17.3)78 (31.5)90 (16.2)96 (30.4)
 Often28 (4.5)16 (6.5)14 (2.5)30 (9.5)
χ2 (p Value)χ2 (p Value)
Gender0.82 (0.36)1.32 (0.25)
 Male138 (29.7)326 (70.3)160 (34.5)304 (65.5)
 Female110 (27.0)298 (73.0)156 (38.2)252 (61.8)
Sport participation0.46 (0.80)3.79 (0.15)
 Currently involved128 (20.5)56 (22.6)118 (21.2)66 (20.9)
 Quit206 (33)80 (32.3)170 (30.6)116 (36.7)
 Never been involved290 (46.5)112 (45.2)268 (48.2)134 (42.4)
Socioeconomic status5.66 (0.06)2.58 (0.27)
 Under average10 (1.6)4 (1.6)10 (1.8)4 (1.3)
 Average574 (92.0)238 (95.7)512 (92.1)300 (95.0)
 Below average40 (6.4)6 (2.4)34 (6.1)12 (3.8)