Table 2.
Baseline demographic and clinical characteristics after propensity score matching (N=14,006)
| Characteristics | Colonoscopy without anesthesia provider N=7,003 |
Colonoscopy with anesthesia provider N=7,003 |
P-value |
|---|---|---|---|
| Sex, N (%) | |||
| Male | 2,755 (39.34) | 2,732 (40.01) | |
| Female | 4,248 (60.66) | 4,271 (60.99) | 0.6905a |
| Age, mean (SD) | 65.57 (9.96) | 65.39 (10.05) | 0.2925b |
| Type of insurance, N (%) | |||
| Commercial | |||
| HMO | 1,172 (16.74) | 1,254 (17.91) | 0.1190a |
| PPO | 1,952 (27.87) | 1,982 (28.30) | |
| Medicare ADV | |||
| HMO | 3,149 (44.97) | 3,112 (44.44) | |
| PFFS | 674 (9.62) | 607 (8.67) | |
| PPO | 56 (0.80) | 48 (0.69) | |
| Geographic region, N (%) | |||
| West | 237 (3.38) | 208 (2.97) | 0.1415a |
| South | 5,936 (84.76) | 6,030 (86.11) | |
| Northeast | 19 (0.27) | 20 (0.29) | |
| Midwest | 811 (11.58) | 745 (10.64) | |
| Charlson comorbidity score, mean (SD) | 0.68 (1.32) | 0.67 (1.32) | 0.5103b |
| Service site, N (%) | |||
| Ambulatory surgical center | 4,390 (62.69) | 4,298 (61.37) | 0.2178a |
| Hospital outpatient | 2,166 (30.93) | 2,206 (31.50) | |
| Physician office | 407 (5.81) | 465 (6.64) | |
| Hospital inpatient | 37 (0.53) | 32 (0.46) | |
| Other provider | 3 (0.04) | 2 (0.03) | |
| Personal history of colonic polyps, N (%) | |||
| Yes | 260 (3.71) | 234 (3.34) | 0.2337a |
| RCRI risk group, N (%) | |||
| High | 430 (6.14) | 444 (6.34) | 0.6248a |
| RCRI factors, N (%) | |||
| Ischemic heart disease (yes) | 1,049 (14.98) | 1,070 (15.28) | 0.6205a |
| Congestive heart failure (yes) | 239 (3.41) | 257 (3.67) | 0.4105a |
| Cerebrovascular disease (yes) | 437 (6.24) | 484 (6.91) | 0.1091a |
| Renal insufficiency (yes) | 257 (3.67) | 205 (2.93) | 0.0139a |
| Diabetes with insulin therapy (yes) | 176 (2.51) | 147 (2.10) | 0.1026a |
| Hyperlipidemia, N (%) | |||
| Yes | 4,686 (66.91) | 4,648 (66.37) | 0.4959a |
| Hypertension, N (%) | |||
| Yes | 4,156 (59.35) | 4,204 (60.03) | 0.4083a |
| Obesity, N (%) | |||
| Yes | 404 (5.77) | 443 (6.33) | 0.1668a |
Notes:
a
P-value for comparison between anesthesia without provider and with provider, calculated by chi-square test;
b
P-value for comparison between anesthesia without provider and with provider, calculated by t-test with equal variance.
Abbreviations: ADV, Advantage; HMO, health maintenance organization; PFFS, private fee-for-service; PPO, preferred provider organization; RCRI, Revised Cardiac Risk Index; SD, standard deviation.