It's the smart estimate, but for SSD's I'd ignore the % health unless you see it go down.
Mine has been at 84% for over 1.15 year of use (10153 hour)
You can use the OCZToolbox to see more smart data.
SMART READ DATA
1: SSD Raw Read Error Rate Normalized Rate: 117 total ECC and RAISE errors
5: SSD Retired Block Count Reserve blocks remaining: 89%
9: SSD Power-On Hours Total hours power on: 14502
12: SSD Power Cycle Count Count of power on/off cycles: 124
171: SSD Program Fail Count Total number of Flash program operation failures: 0
172: SSD Erase Fail Count Total number of Flash erase operation failures: 0
174: SSD Unexpected power loss count Total number of unexpected power loss: 78
177: SSD Wear Range Delta Delta between most-worn and least-worn Flash blocks: 1
181: SSD Program Fail Count Total number of Flash program operation failures: 0
182: SSD Erase Fail Count Total number of Flash erase operation failures: 0
187: SSD Reported Uncorrectable Errors Uncorrectable RAISE errors reported to the host for all data access: 0
194: SSD Temperature Monitoring Current: 0 High: 0 Low: 0
195: SSD ECC On-the-fly Count Normalized Rate: 117
196: SSD Reallocation Event Count Total number of reallocated Flash blocks: 0
231: SSD Life Left Approximate SDD life Remaining: 84%
241: SSD Lifetime writes from host Number of bytes written to SSD: 3840 GB
242: SSD Lifetime reads from host Number of bytes read from SSD: 17856 GB
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