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. 2014 Jan 21;7:57. doi: 10.1186/1756-0500-7-57

Table 2.

Age and years of sport activity, for each study group

Group Age (years) Years of sport activity
Tennis players
12.4 ± 0.7
2,5 ± 0.8
Volleyball players
12.6 ± 0.8
2.4 ± 0.7
Non-sport subjects
12.5 ± 0.8
NA
p-value 0.69 0.69

The data is expressed by average and standard deviation. The statistical comparison between groups is expressed by p value.