Table 1.

Comparison of Respondents and Non-respondents and Additional Characteristics of Respondents and their Practices

Characteristic	Total Respondents (N=303)	Total Non-Respondents (N=145)	P-value, chi-squared test, respondents vs. non-respondents
Provider gender, % (n)
Female	64 (195)	66 (96)	0.70
Male	36 (108)	34 (49)
Mean (SD) provider age in years	53.0 (10.4)	51.8 (10.9)	0.24*
Practice setting, % (n)
Private practice	79 (240)	81 (117)
Hospital or clinic	17 (52)	15 (22)
HMO	4 (11)	4 (6)	0.85
Practice location, % (n)
Rural/Suburban	49 (147)	43 (62)	0.25
Urban	52 (156)	57 (83)
Practice region, % (n)
South	34 (104)	44 (64)
Midwest	23 (70)	18 (26)
West	19 (58)	23 (34)
Northeast	23 (71)	15 (21)	0.04
Practice-level decision-making about vaccines, % (n)
Larger System Level	29 (86)	31 (44)
Independent	71 (208)	69 (99)	0.74
Median (IQR) number of providers in practice	6.0 (3.5–9.0)	5.0 (3.0–10.5)	0.74†
Proportion of privately insured patients in practice, % (n)
0–24	24 (72)	N/A
25–49	23 (48)	N/A
≥50	53 (159)	N/A
Proportion of Medicaid or your state’s Children’s Health Insurance patients in practice, % (n)
0–24	40 (117)	N/A
25–49	27 (79)	N/A
≥50	33 (97)	N/A
Patient race/ethnicity in practice, % (n)
≥10% Black/African American	58 (171)	N/A
≥10% Hispanic	55 (164)	N/A
≥10% Asian/Pacific Islander	32 (96)	N/A

IQR: interquartile range; SD: standard deviation.

^*t-test,

^**Fisher’s Exact test,

^†Wilcoxon Test