Intra-observer reproducibility and inter-observer agreement of Fels skeletal age assessments among male tennis players 8–16 years

Table 1 Descriptive statistics (means ± standard deviations) for skeletal ages of male tennis players (n = 97) by time-moment separately for observer A and observer B; results of comparisons between time moments, technical errors of measurement (TEM) and coefficients of variation (%CV)

Examiner	Unit	Time moment		Paired t- test		Magnitude effect		Reliability
Examiner	Unit	TM1	TM2	t	p	d	(qualitative)	TEM	%CV
Observer A^a	years	13.18 ± 2.47	13.18 ± 2.45	0.098	0.922	0.008	(trivial)	0.15	1.11
Observer B^b	years	13.07 ± 2.39	13.09 ± 2.40	0.563	0.575	0.001	(trivial)	0.23	1.75

TM1 Time-moment 1, TM2 Time-moment 2, d Cohen d-value, p Significance level, TEM Technical error of measurement, %CV Coefficient of variation
^aObserver A assigned one participant as skeletally mature and were excluded
^bObserver B assigned four participants as skeletally mature and were excluded

ISSN: 1471-2431