Table 1

Regression analysis (GLM log link), with time as a factor, of COVID-19 symptom mobile data platforms provided by two sources: KCL ZOE symptom tracker app data for NI and HSC NI Symptom checker feature (COVIDCare NI) and covariate area-level deprivation (MDM)

DateEstimateStd. errorT valuePr(>|t|)Signif. codes
KCL ZOE
Intercept3.1350.032596.505<2.00E-16<0.001
06 Apr 20200.00020.04250.0050.99590
13 Apr 20200.24410.04016.0841.25E-09<0.001
20 Apr 20200.20530.04314.771.89E-06<0.001
27 Apr 20200.14050.04673.0110.00260.001
04 May 20200.15080.04683.2250.0013<0.001
11 May 20200.17750.04653.820.0001<0.001
18 May 20200.35030.04378.0191.29E-15<0.001
23 May 20200.34220.04497.6272.8E-14<0.001
30 May 20200.36620.04717.788.57E-15<0.001
MDM−0.00225.07E-05−43.457<2.00E-16<0.001
COVIDCare NI
Intercept3.1890.032797.495<2e-16<0.001
27 Apr 2020−0.01380.0414−0.3330.7391
04 May 2020−0.00090.0421−0.020.9837
11 May 20200.02780.04240.6540.5128
18 May 20200.04500.04331.0380.2995
23 May 20200.13410.04233.1730.00150.001
30 May 20200.44520.038411.598<2e-16<0.001
MDM−0.00050.0004−11.361<2e-16<0.001
  • The dates shown correspond to the end date of the 14-day symptom reporting sliding window (resulting in a 1-week overlap of data).

  • GLM, generalised linear model; HSC, health and social care; MDM, Multiple Deprivation Measure; NI, Northern Ireland.