Harnessing health plan enrollee data to boost membership in patient-powered research networks

Table 2 Characteristics of health plan members invited to join a Patient-powered research network

Health plan member characteristics	Mail group		Email group		P values
	Mean/N	SD/%	Mean/N	SD/%
N	14,571		14,574
Age, mean (SD)	50. 8	10.5	50.7	10.54	0.50
Age category (years), n (%)					0.55
18–20	41	0.3	46	0.3
21–44	3707	25.4	3797	26.1
45–64	10,073	69.1	10,010	68.7
65 and over	750	5.1	721	4.9
Female, n (%)	11,424	78.4	11,440	78.5	0.85
Residential location (based on zip code), n (%)					0.27
Urban	11,772	80.8	11,845	81.3
Rural	2663	18.3	2615	17.9
Unknown	136	0.9	114	0.8
Health plan coverage, n (%)					0.14
Commercial	14,182	97.3	14,224	97.6
Medicare Advantage	389	2.7	350	2.4
Census Region, n (%)					0.37
Northeast	1164	8.0	1110	7.6
Midwest	5475	37.6	5599	38.4
South	3498	24.0	3497	24.0
West	4434	30.4	4368	30.0
Clinical History^a
Comorbidity score (Deyo-Charlson Index), mean (SD)	2.17	2.62	2.15	2.61	0.29
Comorbidity score category, n (%)					0.46
0	4347	29.8	4406	30.2
1 or 2	6100	41.9	6136	42.1
3 or more	4124	28.3	4032	27.7
Medical Utilization History (all cause)^a
Any hospitalization, n (%)	4432	30.4	4459	30.6	0.74
Any emergency room visit, n (%)	6150	42.2	6244	42.8	0.27
Any Outpatient visit, n (%)	14,571	100.0	14,573	100.0	0.32
Primary care physician visits, n (%)	12,984	89.1	12,955	88.9	0.55
Specialist visits, n (%)	14,458	99.2	14,476	99.3	0.30

SD Standard deviation
^acharacteristics measured using all available coverage period from January 2006 to February 2018

ISSN: 1472-6963