From: Clustering in surgical trials - database of intracluster correlations
 |  | Centre level clustering |  |  |  |  | Surgeon level clustering |  |  |  |  | ||||
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Outcome | Trial | N | Mean/Prop | ICC | BC 95% CI | BCA 95% CI | N | Mean/Prop | ICC | BC 95% CI | BCA 95% CI | ||||
EQ-5D 1 wk | HERNIA | 610 | 0.71 | 0.029 | (0.003, | 0.086) | (0.004, | 0.086) | 610 | 0.71 | 0.023 | (0.003, | 0.057) | (0.004, | 0.070) |
EQ-5D 3 m | HERNIA | 497 | 0.86 | 0 | (0.000, | 0.000)* | (., | .) | 497 | 0.86 | 0 | (0.000, | 0.000)* | (., | .) |
EQ-5D 3 m | KATMETAL | 361 | 0.66 | 0 | (0.000, | 0.000)* | (., | .) | 361 | 0.66 | 0.014 | (0.000, | 0.104) | (0.000, | 0.119) |
EQ-5D 3 m | KATMOBILE | 448 | 0.66 | 0.06 | (0.005, | 0.133) | (0.007, | 0.140) | 448 | 0.66 | 0.071 | (0.021, | 0.149) | (0.023, | 0.159) |
EQ-5D 3 m | KATPATELLA | 1169 | 0.70 | 0.008 | (0.000, | 0.041) | (0.000, | 0.047) | 1169 | 0.70 | 0.005 | (0.000, | 0.032) | (0.000, | 0.032) |
EQ-5D 3 m | REFLUX | 149 | 0.79 | 0.001 | (0.000, | 0.120) | (0.000, | 0.105) | 104 | 0.82 | 0.001 | (0.000, | 0.120) | (0.000, | 0.105) |
EQ-5D 4 m | STARS | 277 | 0.61 | 0 | (0.000, | 0.043) | (0.000, | 0.043) | 277 | 0.61 | 0.015 | (0.000, | 0.109) | (0.000, | 0.112) |
EQ-5D 12 m | KATMETAL | 354 | 0.71 | 0.006 | (0.000, | 0.070) | (0.000, | 0.070) | 354 | 0.71 | 0 | (0.000, | 0.025) | (0.000, | 0.022) |
EQ-5D 12 m | KATMOBILE | 448 | 0.70 | 0.040 | (0.004, | 0.103) | (0.006, | 0.107) | 448 | 0.70 | 0.024 | (0.000, | 0.080) | (0.000, | 0.094) |
EQ-5D 12 m | KATPATELLA | 1157 | 0.74 | 0.017 | (0.000, | 0.052) | (0.000, | 0.061) | 1157 | 0.74 | 0.040 | (0.011, | 0.076) | (0.013, | 0.081) |
EQ-5D 12 m | REFLUX | 152 | 0.75 | 0.007 | (0.000, | 0.107) | (0.000, | 0.100) | 100 | 0.78 | 0.002 | (0.000, | 0.322) | (0.000, | 0.285) |
EQ-5D 12 m | STARS | 274 | 0.63 | 0 | (0.000, | 0.063) | (., | .) | 274 | 0.63 | 0 | (0.000, | 0.083) | (., | .) |
EQ-5D 60 m | KATMETAL | 302 | 0.68 | 0 | (0.000, | 0.000)* | (., | .) | 302 | 0.68 | 0 | (0.000, | 0.000)* | (., | .) |
EQ-5D 60 m | KATMOBILE | 381 | 0.69 | 0.015 | (0.000, | 0.080) | (0.000, | 0.089) | 381 | 0.69 | 0.019 | (0.000, | 0.065) | (0.000, | 0.076) |
EQ-5D 60 m | KATPATELLA | 997 | 0.71 | 0.002 | (0.000, | 0.021) | (0.000, | 0.022) | 997 | 0.71 | 0.009 | (0.000, | 0.047) | (0.000, | 0.050) |
Oxford knee score 3 m | KATMETAL | 327 | 30.14 | 0 | (0.000, | 0.000)* | (., | .) | 327 | 30.14 | 0.007 | (0.000, | 0.057) | (0.000, | 0.059) |
Oxford knee score 3 m | KATMOBILE | 389 | 29.88 | 0.073 | (0.016, | 0.158) | (0.020, | 0.165) | 389 | 29.88 | 0.068 | (0.018, | 0.130) | (0.024, | 0.142) |
Oxford knee score 3 m | KATPATELLA | 1057 | 30.89 | 0.041 | (0.014, | 0.087) | (0.016, | 0.092) | 1057 | 30.89 | 0.05 | (0.021, | 0.087) | (0.021, | 0.087) |
Oxford knee score 12 m | KATMETAL | 311 | 33.71 | 0.021 | (0.000, | 0.042) | (0.000, | 0.042) | 311 | 33.71 | 0.056 | (0.000, | 0.130) | (0.001, | 0.148) |
Oxford knee score 12 m | KATMOBILE | 387 | 32.99 | 0.063 | (0.023, | 0.134) | (0.026, | 0.144) | 387 | 32.99 | 0.059 | (0.012, | 0.134) | (0.014, | 0.139) |
Oxford knee score 12 m | KATPATELLA | 1010 | 34.73 | 0.027 | (0.004, | 0.071) | (0.005, | 0.076) | 1010 | 34.73 | 0.047 | (0.015, | 0.094) | (0.016, | 0.101) |
Oxford knee score 60 m | KATMETAL | 284 | 34.14 | 0 | (0.000, | 0.000)* | (., | .) | 284 | 34.14 | 0.002 | (0.000, | 0.021) | (0.000, | 0.021) |
Oxford knee score 60 m | KATMOBILE | 350 | 33.43 | 0.044 | (0.000, | 0.123) | (0.000, | 0.160) | 350 | 33.43 | 0.051 | (0.000, | 0.121) | (0.004, | 0.143) |
Oxford knee score 60 m | KATPATELLA | 928 | 34.90 | 0.045 | (0.016, | 0.086) | (0.017, | 0.090) | 928 | 34.90 | 0.037 | (0.003, | 0.074) | (0.005, | 0.077) |
Operating time (min) | CLIVIT | 483 | 118.60 | 0.184 | (0.084, | 0.373) | (0.069, | 0.333) | 479 | 118.93 | 0.392 | (0.244, | 0.524) | (0.257, | 0.528) |
Operating time (min) | DISPACT | 344 | 190.03 | 0.268 | (0.188, | 0.418) | (0.188, | 0.418) | 344 | 190.03 | 0.395 | (0.254, | 0.506) | (0.259, | 0.508) |
Operating time (min) | FILMS | 125 | 67.55 | 0.212 | (0.009, | 0.451) | (0.049, | 0.486) | NA | ||||||
Closure time (min) | INSECT | 580 | 15.02 | 0.331 | (0.129, | 0.587) | (0.149, | 0.661) | 579 | 15.03 | 0.466 | (0.338, | 0.593) | (0.342, | 0.600) |
Operating time (min) | KATMETAL | 398 | 106.70 | 0.449 | (0.172, | 0.726) | (0.183, | 0.731) | 398 | 106.70 | 0.514 | (0.278, | 0.727) | (0.302, | 0.752) |
Operating time (min) | KATMOBILE | 503 | 122.37 | 0.167 | (0.092, | 0.294) | (0.093, | 0.295) | 503 | 122.37 | 0.199 | (0.073, | 0.390) | (0.073, | 0.390) |
Operating time (min) | KATPATELLA | 1302 | 126.75 | 0.370 | (0.254, | 0.470) | (0.259, | 0.478) | 1302 | 126.75 | 0.445 | (0.360, | 0.524) | (0.369, | 0.533) |
Operating time (min) | REFLUX | 108 | 112.81 | 0.375 | (0.066, | 0.623) | (0.060, | 0.623) | 104 | 113.16 | 0.375 | (0.066, | 0.623) | (0.060, | 0.623) |
Operating time (min) | STARS | 298 | 62.40 | 0.072 | (0.021, | 0.278) | (0.022, | 0.278) | 298 | 62.40 | 0.093 | (0.003, | 0.222) | (0.013, | 0.248) |
Length of stay (days) | CLIVIT | 488 | 3.05 | 0.065 | (0.000, | 0.367) | (0.000, | 0.319) | 485 | 3.05 | 0 | (0.000, | 0.397) | (0.000, | 0.345) |
Length of stay (days) | DISPACT | 348 | 15.41 | 0.111 | (0.012, | 0.217) | (0.005, | 0.210) | 348 | 15.41 | 0.045 | (0.000, | 0.307) | (0.000, | 0.266) |
Length of stay (days) | INSECT | 589 | 14.59 | 0.012 | (0.000, | 0.059) | (0.000, | 0.049) | 588 | 14.59 | 0 | (0.000, | 0.525) | (0.000, | 0.421) |
Length of stay (days) | REFLUX | 108 | 2.38 | 0.345 | (0.128, | 0.590) | (0.146, | 0.601) | 104 | 2.38 | 0.345 | (0.128, | 0.590) | (0.146, | 0.601) |
Length of stay (days) | STARS | 298 | 12.26 | 0.104 | (0.002, | 0.354) | (0.014, | 0.420) | 298 | 12.26 | 0.104 | (0.002, | 0.354) | (0.014, | 0.420) |
Fistula | DISPACT | 352 | 0.29 | 0.122 | (0.046, | 0.301) | (0.039, | 0.284) | 352 | 0.29 | 0.084 | (0.000, | 0.220) | (0.000, | 0.236) |
Complication 6 m | FILMS | 126 | 0.38 | 0 | (0.000, | 0.000)* | (., | .) | NA | ||||||
Complication 1 wk | HERNIA | 717 | 0.37 | 0 | (0.000, | 0.017) | (., | .) | 717 | 0.37 | 0.009 | (0.000, | 0.050) | (0.000, | 0.053) |
Wound infection | INSECT | 625 | 0.16 | 0.01 | (0.000, | 0.037) | (0.000, | 0.043) | 610 | 0.16 | 0.072 | (0.000, | 0.183) | (0.000, | 0.186) |
HRQ overall score 4 m | STARS | 276 | 68.85 | 0.058 | (0.020, | 0.207) | (0.019, | 0.207) | 276 | 68.85 | 0.114 | (0.030, | 0.222) | (0.032, | 0.224) |
HRQ overall score 12 m | STARS | 258 | 74.04 | 0 | (0.000, | 0.093) | (0.000, | 0.062) | 258 | 74.04 | 0 | (0.000, | 0.126) | (., | .) |
HRQ overall score 24 m | STARS | 236 | 75.37 | 0 | (0.000, | 0.000)* | (., | .) | 236 | 75.37 | 0 | (0.000, | 0.167) | (., | .) |
RQLS score 3 m | REFLUX | 141 | 83.85 | 0.143 | (0.000, | 0.392) | (0.009, | 0.449) | 100 | 86.34 | 0.143 | (0.000, | 0.392) | (0.009, | 0.449) |
RQLS score 12 m | REFLUX | 145 | 84.58 | 0.058 | (0.000, | 0.229) | (0.000, | 0.240) | 94 | 89.10 | 0 | (0.000, | 0.263) | (., | .) |
Distance visual acuity (ETDRS) 6 m | FILMS | 127 | 60.24 | 0.175 | (0.004, | 0.327) | (0.013, | 0.344) | NA |