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Table 1 Results of K-function analyses of space-time clustering for cases of type 1 diabetes diagnosed in north-east England during the period 1990-2007a,b

From: Space-time clustering analyses of type 1 diabetes in children from north-east England: support for an infectious aetiology?

Group Geographical distancec NN thresholdd
All case pairs P = 0.240 P = 0.089
Case pairs aged 0-4 years only P = 0.343 P = 0.541
Case pairs aged 5-9 years only P = 0.112 P = 0.187
Case pairs aged 10-14 years only P = 0.318 P = 0.478
"Male: any" case pairs P = 0.453 P = 0.190
"Female: any" case pairs P = 0.182 P = 0.017
"More densely populated: any" case pairs P = 0.211 P = 0.044
"Less densely populated: any" case pairs P = 0.350 P = 0.226
  1. aCases are temporally close if dates of diagnosis differ by <t where t varies from 0.1 year to 1.5 years in steps of 0.1 year;
  2. bP-value obtained by simulation (999 runs) with dates of diagnosis randomly re-allocated to the cases in the analysis;
  3. cCases are spatially close if locations at diagnosis differ by <s where s varies from 0.5 km to 7.5 km in steps of 0.5 km;
  4. dCases are spatially close if either is within the distance to the Nth NN of the other where N varies from 14 to 28 in steps of 1.