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Table 2 Individual ICC estimates at centre and surgeon levels

From: Clustering in surgical trials - database of intracluster correlations

  

Centre level clustering

    

Surgeon level clustering

    

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

  1. BC 95% CI: Bias corrected bootstrapped 95% confidence interval; BCA 95% CI: Bias corrected and accelerated bootstrapped 95% confidence interval; ETDRS: Early Treatment Diabetic Retinopathy Study; EQ-5D: EUROQOL 5D-3L; HRQ: Hip replacement questionnaire; ICC: Intracluster correlation coefficient; m: month; min: minutes; NA: not applicable; Prop: proportion; RQLS: REFLUX quality of life measure; wk: week.
  2. * 95% bootstrapped confidence interval using percentile method.