Table 2.

The number (n) of participants in each category (compared to normative data) for the seven Back in Action (BIA) tests employed as part of the BIA test battery, including the double and single leg stability tests, the double and single leg countermovement jumps (CMJ) (absolute jump height and power), the plyometric jump (absolute jump height and contact time), the speedy jump test and the quick feet test. Within each of these categories, the patient was compared to the normative data and mean of the normative data was considered the average (Norm), with half of the standard deviation then repeatedly added or subtracted from this average to create five scoring categories: Very Weak (Norm – 1 SD), Weak (Norm – 0.5 SD), Norm, Good (Norm + 0.5 SD), Very Good (Norm + 1 SD).

Category	Double leg stability test	Single leg stability test - Unaffected limb	Single leg stability test - Operated limb	Double leg CMJ (absolute jump height)	Double leg CMJ (power)	Single leg CMJ (absolute jump height) - Unaffected Limb	Single leg CMJ (absolute jump height) - Operated Limb
VERY GOOD (n)	0	1	0	1	8	0	0
GOOD (n)	8	9	9	8	14	2	0
NORM (n)	18	17	18	14	14	23	11
WEAK (n)	5	7	7	8	2	4	6
VERY WEAK (n)	9	6	6	9	2	11	23

Category	Single leg CMJ (power) - Unaffected Limb	Single leg CMJ (power) - Operated Limb	Plyometric jump (absolute jump height)	Plyometric jump (contact time)	Speedy jump test - Unaffected limb	Speedy jump test - Operated limb	Quick feet test
VERY GOOD (n)	19	6	2	1	2	0	2
GOOD (n)	6	7	2	2	3	3	3
NORM (n)	11	23	11	11	11	9	13
WEAK (n)	2	2	11	11	4	6	4
VERY WEAK (n)	2	2	14	15	20	22	18