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Table 2 Overall incidence rate of severe disease and incidence rate by frailty status

From: The association between frailty and severe disease among COVID-19 patients aged over 60 years in China: a prospective cohort study

  Number of severe disease Total person-days Events per 100 person-days (95% CI)
Total (n = 114) 34 (29.82) 2908 1.48 (1.10–1.99)
Non-frail (n = 39) 4 (10.28) 1265 0.32 (0.12–0.84)
Pre-frail (n = 39) 15 (38.46) 879 1.71 (1.03–2.83)
Frail (n = 36) 24 (66.67) 643 3.73 (2.50–5.57)
  1. CI confidence interval