PERSonalised Incentives for Supporting Tobacco cessation (PERSIST) among healthcare employees: evaluation and lessons learned 389 11 Table A1: Perceived stress scale categorised PSS score Control group (%) Intervention group (%) Low stress 0-9 35.7 31.1 Moderate stress 10-19 42.9 45.9 High stress 20+ 21.4 23.0
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