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Table 2 Summary statistics 2014–2017

From: Is there a volume-quality relationship within the independent treatment centre sector? A longitudinal analysis

 Overall mean ± SDBetween SDWithin SDN (n)
Characteristics ITCs
 Number of invasive treatments1571.85 ± 1881.561693.96819.81941 (338)
 FTE physicians2.32 ± 2.452.351.04941 (338)
 FTE nurses1.49 ± 3.553.341.14941 (338)
 Number of locations2.61 ± 3.112.730.82941 (338)
 Chain membership0.40 ± 0.490.470.16941 (338)
 Non-profit providers0.68 ± 0.470.470.00941 (338)
Composite Quality indicators
 Reachable 24/70.67 ± 0.470.310.40716 (313)
 Personnel functioning system0.78 ± 0.410.380.21716 (313)
 Personnel malfunctioning system0.78 ± 0.410.360.22716 (313)
 Patient satisfactory questionnaire0.88 ± 0.330.320.16716 (313)
 ASA classification known0.48 ± 0.500.460.21716 (313)
 Screening delirium0.34 ± 0.480.420.23716 (313)
 Collaboration with (a) hospital(s)0.64 ± 0.480.450.20716 (313)
 Structural and process composite−0.00 ± 3.313.191.48716 (313)
Quality outcomes
 Percentage infections0.28 ± 1.140.960.79877 (318)
 Percentage infections (> 0 postoperative infections & > =50 invasive treatments)0.47 ± 0.620.650.29412 (189)
 Average patient satisfaction score8.74 ± 1.170.401.1219,338 (80)
 Ratio promoters over total number of observations per provider0.52 ± 0.500.170.4719,338 (80)
 Ratio detractors over total number of observations per provider0.03 ± 0.170.040.1719,338 (80)
 Ratio 7 or more over total number of observations per provider0.95 ± 0.220.040.2119,338 (80)
 Ratio 8 or more over total number of observations per provider0.84 ± 0.360.090.3519,338 (80)
 Net Promoter Score (in ratio)0.55 ± 0.190.190.06118 (55)
Control variables
 Specialism ophthalmology0.23 ± 0.420.390.07941 (338)
 Specialism dermatology0.37 ± 0.480.470.13941 (338)
 Specialism orthopaedics0.11 ± 0.310.310.05941 (338)
 Specialism aesthetic surgery0.59 ± 0.490.470.18941 (338)
 Ratio ASA II over total number of patients0.13 ± 0.160.140.08622 (241)
 Ratio ASA III over total number of patients0.01 ± 0.060.040.04623 (242)
Robustness check
 Number of aesthetic invasive treatments502.40 ± 1269.82972.17844.36488 (211)
 Percentage infections after aesthetic surgery0.90 ± 6.817.764.16449 (182)