. 2019 Sep 5;16:38. doi: 10.1186/s12970-019-0305-8

Table 2.

Special Judo Fitness Test (SJFT) data analysis

	All	Caffeine consumers	Caffeine non-consumers	Uor t	P	r_g or d
	n = 22	n = 10	n = 12	Uor t	P	r_g or d
SJFT_R1
Baseline	5.3 (0.7)^a	5.1 (0.9)^a	5.5 (0.5)^a	45.0	0.34	0.25
3 mg/kg	5.6 (0.6)^ab	5.7 (0.5)^b	5.6 (0.7)^ab	51.5	0.60	−0.14
6 mg/kg	5.9 (0.6)^bc	5.7 (0.5)^ab	6.0 (0.6)^b	45.0	0.34	0.25
9 mg/kg	6.0 (0.6)^c	6.0 (0.5)^b	6.0 (0.7)^b	60.0	0.97	0.00
Placebo	5.6 (0.6)^ab	5.6 (0.5)^ab	5.6 (0.7)^ab	57.0	0.87	−0.05
Χ²	21.46	12.85	11.67
P	< 0.001	0.01	0.02
Kendall’s W	0.24	0.32	0.24
SJFT_R2
Baseline	10.0 (1.2)^B	9.9 (1.3)^A	10.1 (1.1)^B	0.36	0.72	0.16
3 mg/kg	10.1 (1.0)^B	9.9 (1.1)^B	10.3 (1.0)^A	0.98	0.34	0.42
6 mg/kg	10.4 (0.8)^B	10.2 (0.6)^A	10.5 (1.0)^A	49.0	0.49	0.18
9 mg/kg	10.5 (0.8)^A	10.7 (0.7)^A	10.3 (0.9)^A	41.0	0.22	−0.32
Placebo	10.3 (0.9)^B	10.3 (0.8)^B	10.3 (1.0)^B	57.0	0.87	−0.05
Χ² or F	6.93	6.84	0.97
P	0.14	0.14	0.43
Kendall’s W or $η_{p}^{2}$	0.08	0.17	0.08
SJFT_R3
Baseline	9.2 (1.3)^aA	9.1 (1.4)^A	9.3 (1.2)^A	0.42	0.68	0.18
3 mg/kg	9.5 (1.0)^aA	8.9 (0.9)^A	9.9 (0.9)^A	26.0	0.03	0.57
6 mg/kg	9.9 (1.1)^bA	9.6 (1.0)^A	10.2 (1.1)^A	43.5	0.22	0.28
9 mg/kg	10.2 (1.1)^bA	9.9 (1.1)^A	10.4 (1.0)^A	42.0	0.25	0.30
Placebo	9.4 (1.1)^aA	9.5 (1.1)^A	9.3 (1.2)^A	55.0	0.77	−0.08
Χ²	19.58	6.79	19.93	–	–	–
P	0.006	0.15	< 0.001	–	–	–
Kendall’s W	0.22	0.17	0.42	–	–	–
SJFT Index
Baseline	13.2 (2.2)	13.9 (2.3)	12.6 (2.0)	–	–	–
3 mg/kg	12.7 (1.8)	13.5 (1.9)	12.0 (1.4)	–	–	–
6 mg/kg	12.6 (1.4)	13.1 (1.2)	12.3 (1.4)	–	–	–
9 mg/kg	12.5 (1.3)	12.7 (1.3)	12.3 (1.3)	–	–	–
Placebo	12.6 (1.7)	13.0 (1.4)	12.2 (1.9)	–	–	–
Dosage effect
F	2.38	–	–
P	0.06	–	–
$η_{p}^{2}$	0.10	–	–
Dosage x caffeine consumption effect
F	1.51	–	–
P	0.21	–	–
$η_{p}^{2}$	0.07	–	–
Statistical significance between SJFT_R2 and SJFT_R3 within the same caffeine dosage
Z or t (Baseline)	2.56	1.56	3.00	–	–	–
P	0.01	0.15	0.01	–	–	–
r_c or d	0.66	0.60	0.65	–	–	–
Z or t (3 mg/kg)	2.83	2.37	1.57	–	–	–
P	0.005	0.02	0.12	–	–	–
r_c or d	0.79	0.89	0.64	–	–	–
Z or t(6 mg/kg)	2.13	1.52	1.83	–	–	–
P	0.03	0.14	0.07	–	–	–
r_c or d	0.64	0.57	0.66	–	–	–
Z or t (9 mg/kg)	1.13	1.84	−0.69	–	–	–
P	0.26	0.07	0.50	–	–	–
r_c or d	0.30	0.61	−0.18	–	–	–
Z or t (Placebo)	3.29	2.03	2.67	–	–	–
P	0.001	0.04	0.008	–	–	–
r_c or d	0.80	0.72	0.89	–	–	–

Values are means (SD). ^abc – different letter inscriptions refer to statistical differences between caffeine dosages; ^ABC – different letter inscriptions refer to statistical differences between SJFT rounds (R₂ and R₃) within the same caffeine dosages. SJFT, Special Judo Fitness Test