Table 2.
Multivariable Models of Predictors of Minimally Invasive and Robot-Assisted Hysterectomy
| Predictor | Minimally Invasive Hysterectomy (v Abdominal Hysterectomy) OR (95% CI) | Robot-Assisted Hysterectomy (v Laparoscopic Hysterectomy) OR (95% CI) |
|---|---|---|
| Year of diagnosis | ||
| 2006 | Referent | — |
| 2007 | 2.19 (1.60 to 2.98)* | — |
| 2008 | 4.84 (3.59 to 6.53)* | — |
| 2009 | 10.50 (7.81 to 14.11)* | Referent |
| 2010 | 19.25 (14.08 to 26.33)* | 1.24 (0.82 to 1.87) |
| 2011 | 33.66 (24.60 to 46.06)* | 1.08 (0.73 to 1.58) |
| Age, years | ||
| < 65-69 | Referent | Referent |
| 70-74 | 1.04 (0.86 to 1.26) | 0.80 (0.54 to 1.19) |
| 75-79 | 1.11 (0.90 to 1.38) | 0.77 (0.50 to 1.19) |
| ≥ 80 | 0.91 (0.73 to 1.13) | 0.59 (0.37 to 0.95)† |
| Race/ethnicity | ||
| White | Referent | Referent |
| Black | 0.73 (0.52 to 1.03) | 1.30 (0.66 to 2.57) |
| Other | 0.72 (0.51 to 1.02) | 0.81 (0.40 to 1.65) |
| Marital status | ||
| Married | Referent | Referent |
| Unmarried | 0.90 (0.77 to 1.05) | 1.34 (0.97 to 1.86) |
| Other | 1.07 (0.69 to 1.65) | 1.61 (0.71 to 3.65) |
| Residence | ||
| Metropolitan | Referent | Referent |
| Nonmetropolitan | 0.97 (0.74 to 1.28) | 1.86 (0.93 to 3.70) |
| Socioeconomic status | ||
| Lowest (first) quintile | Referent | Referent |
| Second quintile | 1.19 (0.94 to 1.50) | 0.71 (0.42 to 1.21) |
| Third quintile | 1.31 (1.01 to 1.70)† | 1.04 (0.59 to 1.82) |
| Fourth quintile | 1.47 (1.15 to 1.88)† | 0.81 (0.49 to 1.36) |
| Highest (fifth) quintile | 1.47 (1.09 to 1.98)† | 0.73 (0.40 to 1.31) |
| Registry area | ||
| East | Referent | Referent |
| Midwest | 0.45 (0.25 to 0.82)† | 2.78 (0.90 to 8.62) |
| West | 1.03 (0.58 to 1.85) | 0.43 (0.15 to 1.23) |
| Comorbidity score | ||
| 0 | Referent | Referent |
| 1 | 0.77 (0.65 to 0.92)† | 0.82 (0.57 to 1.18) |
| ≥ 2 | 0.52 (0.42 to 0.65)* | 1.27 (0.80 to 2.03) |
| Grade | ||
| 1 | Referent | Referent |
| 2 | 0.84 (0.70 to 1.02) | 0.90 (0.62 to 1.32) |
| 3 | 0.62 (0.49 to 0.78)* | 1.05 (0.64 to 1.71) |
| Unknown | 0.79 (0.60 to 1.03) | 0.84 (0.50 to 1.42) |
| Tumor stage | ||
| IA | Referent | Referent |
| IB | 0.99 (0.81 to 1.21) | 1.00 (0.66 to 1.50) |
| INOS | 1.23 (0.80 to 1.92) | 0.87 (0.35 to 2.15) |
| II | 0.70 (0.54 to 0.92)† | 1.17 (0.64 to 2.14) |
| III | 0.68 (0.54 to 0.85)† | 1.15 (0.73 to 1.81) |
| Lymphadenectomy | ||
| No | Referent | Referent |
| Yes | 0.89 (0.74 to 1.07) | 2.05 (1.41 to 2.98)† |
| Histology | ||
| Endometrioid | Referent | Referent |
| Carcinosarcoma | 0.34 (0.20 to 0.56)* | 1.07 (0.38 to 3.04) |
| Serous | 1.08 (0.81 to 1.45) | 1.79 (0.94 to 3.39) |
| Teaching hospital | ||
| No | Referent | Referent |
| Yes | 1.03 (0.70 to 1.52) | 1.31 (0.57 to 3.00) |
| Unknown | 1.24 (0.81 to 1.89) | 1.83 (0.75 to 4.47) |
| NCI center | ||
| No | Referent | Referent |
| Yes | 0.93 (0.48 to 1.81) | 5.61 (1.36 to 23.16)† |
| Unknown | NA | NA |
| Hospital beds | ||
| < 200 | Referent | Referent |
| 200-400 | 1.36 (0.82 to 2.25) | 7.29 (2.01 to 26.45)† |
| 401-600 | 2.93 (1.56 to 5.49)† | 3.90 (0.92 to 16.47) |
| > 600 | 4.05 (2.03 to 8.11)* | 8.11 (1.77 to 37.25)† |
| Unknown | NA | NA |
| Hospital volume | ||
| Low | Referent | Referent |
| Intermediate | 1.80 (1.07 to 3.03)† | 1.83 (0.74 to 4.53) |
| High | 1.38 (0.63 to 3.05) | 0.99 (0.29 to 3.38) |
| Unknown | NA | NA |
Abbreviations: NA, Not applicable for the colinearity between hospital factors; OR, odds ratio.
*
P < .001.
†
P < .05.