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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Am J Ind Med. 2020 Nov 18;64(1):13–25. doi: 10.1002/ajim.23200

TABLE III.

Time from initial injury to first reinjury, and rate of first reinjury per 100 worker-years, by degree of impairment and timescale

Impairment N Calendar quarters Quarters with any wages FTE quarters (hours worked/520)
P25 (95% CI) Rate (95% CI) P25 (95% CI) Rate (95% CI) P25 (95% CI) Rate (95% CI)
Overall 43,114 17 (16–17) 5.9 (5.8–6.0) 10 (10–11) 10.0 (9.9–10.2) 7.4 (7.2–7.6) 12.5 (12.3–12.7)
No PPD 31,912 16 (15–16) 6.1 (6.0–6.3) 11 (10–11) 9.8 (9.6–10.0) 7.7 (7.5–8.0) 12.2 (12.0–12.5)
WBI <10% 8,404 17 (16–18) 5.5 (5.3–5.7) 10 (10–11) 10.1 (9.7–10.4) 7.2 (6.8–7.6) 12.4 (12.0–12.9)
WBI ≥10% 2,798 21 (19–23) 4.9 (4.6–5.2) 8 (8–9) 12.7 (11.9–13.5) 5.0 (4.6–5.6) 16.8 (15.7–17.9)

Note: The 25th percentile was used for this table because the median was not observed for calendar quarters (i.e., <50% of injured workers were reinjured during follow-up).

Abbreviations: CI, confidence interval; FTE, full-time equivalent; P25, 25th percentile; PPD, permanent partial disability; WBI, whole body impairment.