Table 6.

Proportion of patients reporting floor^a or ceiling^b effects for each outcome at different time points.

	SF-12 PCS		SF-12 MCS		SF-36 PCS		SF-36 MCS		ODI		VAS
	Floor	Ceiling	Floor	Ceiling	Floor	Ceiling	Floor	Ceiling	Floor	Ceiling	Floor	Ceiling
Preoperative	0	0	0	0	0	0	0	0	0.21	0	2.5	8.3
3 months	0	0	0	0	0	0	0	0	5.1	0	5.1	0.9
6 months	0	0	0	0	0	0	0	0	3.8	0	11.5	0

^aFloor: Percent of patients with the lowest possible score.

^bCeiling: Percent of patients with the highest possible score.