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. Author manuscript; available in PMC: 2015 Sep 29.
Published in final edited form as: Stud Health Technol Inform. 2015;216:569–573.

Table 2.

Comparison between the convenience sample of the study population and the patient population.

Feature (mean ± SD) Study population Patient population Difference, mean (95% CI) P value
N 198,050 15,575,484 -- --
Age 58.3 ± 9.4 60.6 ± 13.3 − 2.3 (− 2.34 to − 2.26) < 0.0001
N 62,931 15,575,484 -- --
HbA1c 8.2 ± 1.0 7.2 ± 1.7 1.0 (0.99 to 1.01) < 0.0001
N 70,678 15,575,484 -- --
BMI 30.5 ± 5.2 32.9 ± 7.6 − 2.4 (− 2.44 to − 2.36) < 0.0001