. 2020 Jul 24;11:1360. doi: 10.3389/fpsyg.2020.01360

Table 1.

^†Alpha levels for significance were predetermined at 0.05 (significant, *), 0.01, and 0.001 (highly significant, ** and ***, respectively).

	Expert drummers (ED) N = 11	Amateur drummers (AD) N = 11
	Median (min/max)	Median (min/max)	*Mann–Whitney U p-value (2-tailed)^†*
Age (yrs)	24.0 (19.4/40.1)	27.7 (21.1/34.4)	0.077
AoC (yrs)	9 (4/14)	14 (9/22)	**
YoP (yrs)	16 (9.6/35.1)	12.7 (3.0/21.4)	n.s.
CLP (1,000 h)	8.8 (3/15)	2.4 (0.5/6.9)	***

Descriptive overview of relevant demographic data of the ED and AD groups. AoC, age of commencement of musical practice (drums); YoP, total years of practice (drums); CLP, cumulative life-time practice (from year-by-year daily/weekly practice according to retrospective self-reports).