Factors Associated With Longitudinal Psychological and Physiological Stress in Health Care Workers During the COVID-19 Pandemic: Observational Study Using Apple Watch Data.

A significant trend between New York City’s COVID-19 case count and longitudinal stress was observed only in the high tertial emotional support group (estimate 1.22, P =.005), not in the low (estimate –1.45, P =.26) or medium (estimate 0.98, P =.16) tertials (Figure S1B, Multimedia Appendix 2 ).

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23); however, we noted a borderline significant increase in stress following the 4-week period after a COVID-19 diagnosis ( P = . 05).

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