Table 3. Analytical Sample Sizes for Each Outcome by Practice-Based Research Network (PBRN) (Baseline/Follow-Up) and Health Risk Assessment Follow-Up Intervals
PBRN IDDietPhysical ActivitySmokingAlcoholQuality of LifeDays to Final Follow-Up Assessment*
1848/174871/172873/173850/105233/164186 (43), 181
2422/294421/294424/294421/292420/293177 (47), 188
3157/79155/76155/780/0149/79292 (70), 282
488/3987/3988/3988/3988/39158 (44), 181
51573/8721514/8491568/8491512/8691237/69531 (0), 31
8386/236363/237405/236112/27344/231349 (84), 359
988/4588/46†87/4586/13199 (62), 196

  • ↵* Values shown as mean (standard deviation), median.

  • ↵† Smoking calculations for PBRN 9 were attempted but there were too few patients at follow-up.