Table 4.
Unadjusted Length of Stay Associated with Patient and Provider Characteristics
| Values given are transformed mean LOS (95% CI) |
Total Knee Arthroplasty | Total Hip Arthroplasty | |||
|---|---|---|---|---|---|
| Patient Characteristics | |||||
| Gender | MALE | 3.68 (3.66, 3.70) | p < 0.0001 | 3.82 (3.80, 3.84) | p < 0.0001 |
| FEMALE | 3.78 (3.76, 3.79) | 3.98 (3.96, 3.99) | |||
| Age | 18-44 | 3.41 (3.48, 3.63) | p < 0.0001 | 3.70 (3.65, 3.75) | p < 0.0001 |
| 45-64 | 3.63 (3.62, 3.65) | 3.75 (3.73, 3.77) | |||
| 65-84 | 3.79 (3.78, 3.81) | 3.98 (3.96, 4.00) | |||
| 85+ | 4.06 (4.00, 4.13) | 4.69 (4.59, 4.79) | |||
| Race | WHITE | 3.69 (3.67, 3.70) | p < 0.0001 | 3.92 (3.90, 3.94) | p < 0.0001 |
| BLACK | 3.90 (3.85, 3.95) | 4.11 (4.03, 4.18) | |||
| OTHER* | 3.89 (2.62, 5.76) | 3.94 (2.66, 5.85) | |||
| MISSING | 3.77 (2.70, 5.26) | 3.84 (2.67, 5.53) | |||
| Charlson Score |
0 | 3.65 (3.64, 3.66) | p < 0.0001 | 3.80 (3.78, 3.81) | p < 0.0001 |
| 1 | 3.85 (3.83, 3.88) | 4.08 (4.04, 4.11) | |||
| 2+ | 4.18 (4.14, 4.23) | 4.56 (4.49, 4.64) | |||
| Income | $1-24,999 | 3.94 (3.87, 4.00) | p < 0.0001 | 4.26 (4.16, 4.36) | p < 0.0001 |
| $25-34,999 | 3.77 (3.75, 3.80) | 3.99 (3.95, 4.02) | |||
| $35-44,999 | 3.78 (3.75, 3.80) | 3.96 (3.93, 3.98) | |||
| $45+ | 3.70 (3.68, 3.71) | 3.85 (3.83, 3.87) | |||
| Insurance | PRIVATE | 3.58 (3.56, 3.60) | p < 0.0001 | 3.68 (3.66, 3.70) | p < 0.0001 |
| MEDICARE | 3.81 (3.80, 3.82) | 4.05 (4.03, 4.07) | |||
| MEDICAID | 4.12 (4.03, 4.20) | 4.31 (4.20, 4.41) | |||
| OTHER | 3.83 (3.78, 3.89) | 4.02 (3.91, 4.12) | |||
| Provider Characteristics | |||||
| Region | Northeast | 3.63 (2.53, 5.21) | p < 0.0001 | 3.86 (2.68, 5.55) | p < 0.0001 |
| Midwest | 3.76 (2.72, 5.19) | 3.91 (2.80, 5.48) | |||
| South | 3.79 (2.60, 5.51) | 4.00 (2.74, 5.82) | |||
| West | 3.75 (2.61, 5.38) | 3.84 (2.64, 5.57) | |||
| Setting | Urban | 3.73 (2.62, 5.30) | p < 0.0001 | 3.88 (2.70, 5.58) | p < 0.0001 |
| Rural | 3.85 (2.60, 5.69) | 4.13 (2.85, 6.00) | |||
| Teaching Status |
Non-teaching | 3.75 (2.60, 5.40) | p = 0.3000 | 3.97 (2.77, 5.69) | p < 0.0001 |
| Teaching | 3.74 (2.64, 5.29) | 3.86 (2.67, 5.57) | |||
| Bed size | Small | 3.83 (2.73, 5.38) | p < 0.0001 | 4.04 (2.90, 5.63) | p < 0.0001 |
| Medium | 3.71 (2.62, 5.25) | 3.89 (2.73, 5.54) | |||
| Large | 3.74 (2.59, 5.39) | 3.89 (2.67, 5.65) | |||
| Surgeon Volume |
TKA: 1-17; THA: 1-10 | 3.95 (2.48, 5.42) | p < 0.0001 | 4.30 (2.77, 5.82) | p < 0.0001 |
| TKA: 18-35; THA: 11-21 | 3.80 (2.37, 5.22) | 3.96 (2.55, 5.37) | |||
| TKA: 36-66; THA: 22-52 | 3.61 (2.20, 5.01) | 3.79 (2.41, 5.17) | |||
| TKA: ≥ 67; THA: ≥53 | 3.45 (2.02, 4.88) | 3.50 (2.07, 4.94) | |||
| VOLUME MISSING | 3.82 (2.71, 5.38) | 3.95 (2.79, 5.60) | |||
| Hospital Volume |
TKA: 1-100; THA: 1-64 | 3.95 (2.49, 5.40) | p < 0.0001 | 4.17 (2.69, 5.64) | p < 0.0001 |
| TKA: 101-197; THA: 65-123 | 3.66 (2.21, 5.11) | 3.91 (2.47, 5.34) | |||
| TKA: 198-293; THA: 124-224 | 3.77 (2.37, 5.16) | 3.86 (2.47, 5.24) | |||
| TKA: ≥ 294; THA: ≥ 225 | 3.61 (2.20, 5.02) | 3.72 (2.27, 5.16) | |||
| Ownership | ALL HOSPITALS | 3.74 (2.64, 5.28) | p < 0.0001 | 3.88 (2.69, 5.89) | p < 0.0001 |
| PUBLIC | 3.97 (2.72, 5.81) | 4.17 (2.85, 6.10) | |||
| NON-PROFIT | 3.73 (2.64, 5.28) | 3.88 (2.71, 5.56) | |||
| FOR-PROFIT | 3.69 (2.46, 5.53) | 4.02 (2.82, 5.75) | |||
Other race includes: Hispanic, Native American, Asian or Pacific Islander, or Other