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Table 4 Rate ratios for severe COVID-19 by time window of hospital in-patient exposure, excluding care home residents

From: Relation of severe COVID-19 in Scotland to transmission-related factors and risk conditions eligible for shielding support: REACT-SCOT case-control study

Time window of exposure Controls Cases Rate ratio (95% CI) p-value
Less recent interval only 494 (29%) 147 (6%)   .
Recent interval only 470 (28%) 799 (35%) 5.9 (3.6, 9.7) <0.001
Both intervals 741 (43%) 1335 (59%) 6.9 (4.3, 11.1) <0.001
  1. Rate ratios are from conditional logistic regression models
  2. Dataset restricted to those exposed at some time between 5 and 24 days before first testing positive
  3. Recent interval = days 5 to 14 before first testing positive, less recent interval = days 15 to 24 before first testing positive
  4. Reference category is exposure in less recent interval only