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. 2023 Feb 17;11:e14878. doi: 10.7717/peerj.14878

Table 3. Results of changes in body fat and fat-free mass (kg) of bodybuilders of the examined groups during the study (IQR), n = 64.

Groups	Terms of observation, weeks				χ², df = 3, W
	Initial data	4	8	12
Fat-free mass, kg
1	72.43 (5.86) H = 1.78, p = 0.61	73.65 (9.52) 1,7%¹^,^*	74.11 (8,30) 0,6%¹^,^*	74.93 (8.41) 1.1%¹^,^, 3.4%²^,^**	χ² = 28.58^* W = 0.59^*
3	71.10 (6.88) H = 1.78, p = 0.61	73.20 (7.39) 2,9%¹^,^**	73.70 (6.86) 0,7%¹^,^*	73.83 (7,01) 0.2%, 3.8%²^,^***	χ² = 38.77^* W = 0.80^*
2	71.14 (7.63) H = 1.78, p = 0.61	71.42 (7.41) 0,4%	72.59 (8.51) 1,6%¹*	73.39 (7.86) 1.1%¹, 3.1%²^,^***	χ² = 29.10^* W = 0.60^*
4	73.08 (10.51) H = 1.78, p = 0.61	75.23 (9.74) 2,9%¹^,^*	76.67 (9.00) 1,9%¹^,^*	77.29 (8.05) 0.8%¹, 5.7%²^,^***	χ² = 45.07^* W = 0.93^*
Body fat, %
1	15.43 (3.91) H = 1.71, p = 0.63	13.11 (3.07) −2,3%¹^,^*	12.02 (1.65) −1,1%¹^,^*	11.39 (1.42) −0.6%, −4.0%²^,^***	χ² = 45.90^* W = 0.95^*
3	14.45 (1.78) H = 1.71, p = 0.63	14.34 (1.46) −0.1¹	14.38 (1.48) 0,04¹	14.34 (1.52) −0.04¹, −0.1%²	χ² = 14.38^* W = 0.30^*
2	15.98 (3.33) H = 1.71, p = 0.63	13.46 (1.60) −2,5%¹^,^*	12.60 (1.67) −0,9%¹^,^*	12.33 (1.74) −0.3%, −3.6%²^,^***	χ² = 41.18^* W = 0.85^*
4	15.32 (3.55) H = 1.71, p = 0.63	14.51 (2.28) −0.8%¹	14.43 (1.75) −0.1¹	14.65 (1.67) 0.2¹, −0.6%²	χ² = 4.72 W = 0.09

Notes.

¹

difference (%) compared to previous results.

²

difference (%) in comparison with the initial data.

df: is the number of degrees of freedom
H: Kruskal-Wallis H test
χ²: Friedman’s test
W: is the Kendall’s coefficient of concordance

^*

p < .05.

^***

p < .001.