Table 2.

Diurnal changes of intervertebral discs (IVDs) according to weightlifting (n = 25).

Variable	WL (n = 12)	NWL (n = 13)	P-value*
	Mean (SD)
Age (yrs)	31.4 (8.7)	27.9 (4.3)	0.212
Males (%)	8 (66.7)	7 (53.8)	0.513
T2 values (ms) of spine
Morning	94.1 (14.1)	97.2 (17.4)	0.635
Evening	85.6 (14.9)	87.2 (13.5)	0.785
Difference between morning and evening	− 8.5 (8.9)	− 10.0 (8.9)	0.681†

n number, SD standard deviation, yrs years, % percent, ms milliseconds, vs versus.

*Unpaired t-test and chi-squared test.

^†Remained non-significant with propensity-score matching analysis (P = 0.360).