Table 5

Multivariable linear regressions with ABQ-score as the dependent variable

	All athletes (N=210)						Endurance		Technical		Team sports
	Both sexes (N=210)		Boys (N=135)		Girls (N=75)		(N=57)		(N=47)		(N=106)
	P value	B (95% CI)	P value	B (95% CI)	P value	B (95% CI)	P value	B (95% CI)	P value	B (95% CI)	P value	B (95% CI)
Illnesses	<0.001	0.21 (0.10 to 0.32)	0.27	0.11 (−0.09 to 0.31)	0.042	0.19 (0.01 to 0.37)	0.033	0.20 (0.02 to 0.38)	<0.001	0.19 (−0.10 to 0.47)	0.017	0.26 (0.05 to 0.48)
Acute injuries	0.007	0.16 (0.04 to 0.27)	0.001	0.24 (0.10 to 0.38)	0.60	0.06 (−0.16 to 0.28)	0.41	−0.50 (−1.73 to 0.72)	0.005	0.50 (0.16 to 0.85)	0.11	0.1 (−0.02 to 0.23)
Overuse injuries	0.015	0.10 (0.02 to 0.18)	0.29	0.07 (−0.06 to 0.19)	0.22	0.08 (−0.05 to 0.21)	0.30	−0.30 (−0.87 to 0.28)	0.65	0.04 (−0.15 to 0.24)	0.015	0.12 (0.02 to 0.22)
QBPNS-score (1-5)	0.011	−0.01 (−0.02 to 0.00)	0.016	−0.01 (−0.02 to 0.00)	0.31	−0.01 (−0.04 to 0.01)	0.50	−0.01 (−0.02 to 0.03)	0.16	−0.02 (−0.05 to 0.01)	0.016	−0.01 (−0.03 to 0.00)
Influence on training week
Personal	0.14	−0.08 (−0.19 to 0.03)	0.17	−0.08 (−0.2 to 0.04)	0.44	−0.09 (−0.33 to 0.15)	0.42	−0.08 (−0.39 to 0.16)	0.48	0.12 (−0.22 to 0.45)	0.36	−0.06 (−0.19 to 0.07)
Coach	<0.001	−0.33 (−0.35 to –0.15)	<0.001	−0.33 (−0.45 to –0.22)	0.09	−0.17 (−0.37 to 0.03)	<0.001	−0.33 (−0.69 to –0.25)	0.01	−0.37 (−0.64 to –0.09)	0.011	−0.17 (−0.30 to –0.04)
Social environment
Sports	0.19	−0.06 (−0.20 to 0.04)	0.36	−0.06 (−0.2 to 0.08)	0.87	−0.02 (−0.27 to 0.23)	0.011	−0.06 (−0.8 to –0.11)	0.84	0.03 (−0.24 to 0.29)	0.13	−0.15 (−0.35 to 0.05)
School	0.10	0.02 (−0.19 to 0.02)	0.76	0.02 (−0.1 to 0.14)	0.15	−0.15 (−0.36 to 0.06)	0.031	0.02 (−0.45 to –0.02)	<0.001	−0.44 (−0.66 to –0.22)	0.19	0.11 (−0.05 to 0.27)
Goal achievement school	0.77	0.01 (−0.08 to 0.11)	0.84	0.01 (−0.09 to 0.11)	0.51	−0.08 (−0.31 to 0.16)	0.14	0.01 (−0.34 to 0.05)	0.54	0.08 (−0.19 to 0.35)	0.21	0.08 (−0.04 to 0.20)
Travel time to school	0.54	0.01 (0.00 to 0.01)	0.018	0.01 (0.00 to 0.01)	0.62	0.00 (−0.01 to 0.01)	0.61	0.01 (−0.02 to 0.01)	0.16	0.01 (0.00 to 0.01)	0.87	0.00 (−0.01 to 0.01)
Living away from home
1 year	0.84	0.29 (−0.39 to 0.48)	0.22	0.29 (−0.17 to 0.75)	0.60	−0.26 (−1.26 to 0.73)	0.44	0.29 (−1.68 to 0.75)	0.38	−0.34 (−1.11 to 0.43)	0.012	0.88 (0.20 to 1.55)
2 years	0.27	0.12 (−0.33 to 1.19)	0.74	0.12 (−0.61 to 0.85)	0.37	0.43 (−0.53 to 1.40)	0.90	0.12 (−1.58 to 1.79)	0.028	0.91 (0.11 to 1.71)	0.62	−0.25 (−1.25 to 0.75)
3 years	0.40	−0.17 (−0.91 to 0.37)	0.55	−0.17 (−0.75 to 0.40)	Omit.		0.62	−0.17 (−0.93 to 1.55)	Omit.		0.56	−0.23 (−1.02 to 0.56)
Adjusted R² for model	0.27		0.36		0.13		0.41		0.39		0.29

Some variables are omitted due to collinearity. Values for ‘All health problems’, ‘Illnesses’, ‘Acute injuries’ and ‘Overuse injuries’ are yearly averages per athlete and given in thousands.
ABQ, Athlete Burnout Questionnaire; B, regression coefficient; QBPNS, Questionnaire of Basic Psychological Need Support.