Table 2.

Practice Characteristics

Practice Characteristics *	Control (N = 25)	Intervention (N = 24)
N = 49	N (%)	N (%)
Number of recruited patients
- Mean (SD)	13 (6)	12 (7)
- (min, max)	(4, 33)	(1, 26)
- IQR	(9–15)	(6–16)
Practice type
- Solo private	8 (32)	6 (25)
- Group private	16 (64)	16 (67)
- Community clinic or health center	0 (0)	1 (4)
- Other	1 (4)	1 (4)
Number of physicians and nurse practitioners
- 1	7 (28)	3 (13)
- 2–4	9 (36)	6 (25)
- 5–10	8 (32)	9 (38)
- >10	1 (4)	6 (25)
Number of medical assistants and nurses
- 1	1 (4)	1 (4)
- 2–4	11 (44)	11 (46)
- 5–10	11 (44)	6 (25)
- >10	2 (8)	6 (25)
How long practice has been using spirometry
- Never	13 (52)	12 (50)
- 6 months	1 (4)	1 (4)
- 1 year	1 (4)	1 (4)
- >1 year	10 (40)	10 (42)
Practice with ≥ 1 staff member having a high level of spirometry experience at baseline**
% of practice patients insured by Medicaid***	9 (36)	12 (50)
- > 0–10%	8 (32)	7 (28)
- 11–20%	5 (20)	6 (24)
- 21–39%	6 (24)	4 (16)
- 40–75%	6 (24)	8 (32)
Network
PSPRN	1 (4)	3 (12)
SCOR	24 (96)	22 (88)
Geographic Setting
Rural	6 (24)	3 (12)
Suburban	11 (44)	12 (48)
Urban	8 (32)	10 (40)

^*The distribution of these characteristics did not vary significantly between control and intervention.

^**High level of experience = > 10 tests performed in the past year or > 25 tests performed during professional career.

^***This estimate includes all practice patients not just those enrolled in the study.