Data analysis was performed using IBM’s SPSS Statistical Package (Version 22). Descriptive statistics were used to examine the basic features of the sample. Furthermore, data were analysed using repeated multivariate analysis of variance test.
Analysis of child cyclists' knowledge
Table 1 displays results of the two-way repeated multivariate analysis of variance (MANOVA) test. The test was carried out in order to examine the intervention effect on children’s knowledge on cycling safety. The findings indicated that there was a statistically significant difference between the intervention and control group on children’s cycling knowledge for the period of time F(8, 170) = 2.99, p < 0.01, η2=0.12. Univariate test was performed on each dependent variable, and revealed that intervention had a statistically significant multivariate effect on children’s knowledge concerning age requirements for riding a bicycle on public roads F(1, 177) = 7.37, p < 0.01, η2=0.04, identification of risky cycling behaviour F(1, 177) = 4.50, p < 0.05, η2=0.03, road signs F(1, 177) = 8.15, p < 0.01, η2=0.04, and total knowledge score F(1, 177) = 5.89, p < 0.05, η2=0.03. In regards to knowledge of bicycle parts and equipment F(1, 177) = 0.03, p > 0.05, η2=0.00, cycling clothing gear F(1, 177) = 0.03, p > 0.05, η2=0.00, using proper hand signals F(1, 177) = 0.57, p > 0.05, η2=0.00, and understanding of the road environment F(1, 177) = 0.89, p > 0.05, η2=0.00 statistically significant impacts for the time by condition interaction were not found.
Table 1 Effects of the intervention on children’s cycling related knowledge
Cycling knowledge
|
Group
|
Pre-intervention
|
Post intervention
|
F – value
|
Mean (SD)
|
Mean (SD)
|
Age requirements
|
Control
|
79.5 (40.6)
|
77.1 (42.3)
|
7.37**
|
Intervention
|
76.0 (42.9)
|
89.6 (30.7)
|
Risky behaviors
|
Control
|
100.0 (0.0)
|
96.4 (18.8)
|
4.50*
|
Intervention
|
89.6 (30.7)
|
94.8 (22.3)
|
Bicycle parts and equipment
|
Control
|
53.6 (34.7)
|
54.2 (42.2)
|
0.03
|
Intervention
|
61.5 (36.6)
|
63.0 (35.7)
|
Cycling clothing gear
|
Control
|
72.7 (27.7)
|
72.7 (31.7)
|
0.03
|
Intervention
|
80.2 (24.5)
|
80.9 (26.4)
|
Road signs
|
Control
|
68.0 (22.1)
|
67.7 (24.0)
|
8.15**
|
Intervention
|
64.6 (23.5)
|
73.1 (23.5)
|
Hand signals
|
Control
|
83.1 (37.7)
|
85.5 (35.4)
|
0.57
|
Intervention
|
82.3 (38.4)
|
80.2 (40.1)
|
Understanding the road environment
|
Control
|
56.9 (31.6)
|
54.8 (34.1)
|
0.89
|
Intervention
|
59.1 (29.7)
|
61.7 (29.7)
|
Total
|
Control
|
68.1 (19.1)
|
67.3 (20.2)
|
5.89*
|
Intervention
|
68.9 (17.8)
|
73.4 (17.4)
|
Note: *p < 0.05; **p < 0.01; ***p < 0.001
Child cyclists' cycling skills analysis
The MANOVA was performed with the purpose of testing the effect of intervention on children’s cycling skills (see Table 2). A statistically significant multivariate effect was obtained F(15, 163) = 11.01, p < 0.001, η2=50.30, which demonstrates a significant difference between pre-intervention and post-intervention period. The univariate tests indicated significant effect for fitting F(1, 177) = 10.35, p < 0.01, η2=0.06 and checking a helmet F(1, 177) = 24.35, p < 0.001, η2=0.12, adjusting a bicycle F(1, 177) = 5.00, p < 0.05, η2=0.03, starting the movement F(1, 177) =7.16, p < 0.01, η2=0.04, cycling in a straight line F(1, 177) =6.77, p < 0.05, η2=0.04, obeying the “stop” sign F(1, 177) =18.96, p < 0.001, η2=0.10, riding through intersections F(1, 177) =34.02, p < 0.001, η2=0.16, manoeuvring to avoid obstacles F(1, 177) =52.03, p < 0.001, η2=0.23, giving the signal for turning F(1, 177) =39.76, p < 0.001, η2=0.18, turning left F(1, 177) =98.15, p < 0.001, η2=0.36, giving way to pedestrians F(1, 177) =15.57, p < 0.001, η2=0.08, sudden braking and with control F(1, 177) =12.62, p < 0.001, η2=0.07, manoeuvring around cones F(1, 177) =7.77, p < 0.01, η2=0.04, using a pedestrian crossing F(1, 177) =17.59, p < 0.001, η2=0.09, and total cycling skills score F(1, 177) = 127.20, p < 0.001, η2=0.42. However, a non-significant interaction effect between control and intervention group was found in terms of checking the bicycle before riding F(1, 177) = 2.21, p > 0.05, η2=0.01.
Table 2 Effects of the intervention on children’s cycling skills
Cycling skills
|
Group
|
Pre-intervention
|
Post intervention
|
F – value
|
Mean (SD)
|
Mean (SD)
|
Fitting the helmet
|
Control
|
1,01 (0.11)
|
1,04 (0.19)
|
10.35**
|
Intervention
|
1,04 (0.20)
|
1,46 (1.11)
|
Checking the helmet
|
Control
|
1,01 (0.11)
|
1,07 (0.30)
|
24.35***
|
Intervention
|
1,04 (0.20)
|
1,71 (1.03)
|
Adjusting the bicycle
|
Control
|
1,02 (0.22)
|
1,06 (0.24)
|
5,00*
|
Intervention
|
1,03 (0.17)
|
1,24 (0.59)
|
Checking the bicycle
|
Control
|
1,05 (0.44)
|
1,04 (0.19)
|
2.21
|
Intervention
|
1,04 (0.41)
|
1,19 (0.74)
|
Starting the movement
|
Control
|
4,17 (1.46)
|
4,07 (1.31)
|
7.16**
|
Intervention
|
3,83 (1.63)
|
4,34 (1.37)
|
Cycling in a straight line
|
Control
|
4,52 (1.15)
|
4,53 (1.05)
|
6,77*
|
Intervention
|
4,20 (1.44)
|
4,63 (1.13)
|
Obeying the ‘stop’ sign
|
Control
|
3,39 (1.87)
|
3,42 (1.65)
|
18,96***
|
Intervention
|
3,29 (1.89)
|
4,45 (1.38)
|
Riding through intersections
|
Control
|
2,10 (1.36)
|
2,21 (1.30)
|
34,02***
|
Intervention
|
2,27 (1.50)
|
3,74 (1.42)
|
Maneuvering to avoid obstacles
|
Control
|
1,60 (0.62)
|
1,68 (0.61)
|
52,03***
|
Intervention
|
1,46 (0.58)
|
2,70 (1.21)
|
Giving the signal for turning
|
Control
|
1,28 (1.00)
|
1,24 (0.62)
|
39,76***
|
Intervention
|
1,01 (0.10)
|
2,43 (1.88)
|
Turning left
|
Control
|
1,67 (1.21)
|
1,70 (1.06)
|
98,15***
|
Intervention
|
1,45 (1.02)
|
3,52 (1.30)
|
Giving way to pedestrians
|
Control
|
3,92 (1.54)
|
3,88 (1.43)
|
15,57***
|
Intervention
|
3,89 (1.69)
|
4,60 (1.08)
|
Sudden braking and with control
|
Control
|
3,78 (1.65)
|
3,73 (1.46)
|
12,62***
|
Intervention
|
3,83 (1.63)
|
4,50 (1.19)
|
Maneuvering around cones
|
Control
|
3,64 (1.48)
|
3,72 (1.46)
|
7,77**
|
Intervention
|
3,48 (1.51)
|
4,09 (1.47)
|
Using a pedestrian crossing
|
Control
|
1,48 (0.92)
|
1,51 (0.68)
|
17,59***
|
Intervention
|
1,83 (1.04)
|
2,64 (1.21)
|
Total
|
Control
|
2,38 (0.57)
|
2,44 (0.45)
|
127,20***
|
Intervention
|
2,31 (0.58)
|
3,15 (0.71)
|
Note: *p < 0.05; **p < 0.01; ***p < 0.001