Table 3 Logistic regression analysis of the use of trochanteric support plate (TSP) in adjunction to a sliding hip screw (SHS) depending on patient characteristics, fracture classification, and hospital characteristics. The analysis was performed on 10,600 cases operated with SHS (7308 (69%) without TSP and 3292 (31%) with TSP) with complete data

 Higher age (years)

1.0

0.99–1.0

0.9

 Female sex

1.2

1.1–1.3

0.004

 ASA > 2

1.1

1.0–1.2

0.05

 Cognitive impairment (yes)

1.1

0.97–1.2

0.2

 AO/OTA 31A1

1

 AO/OTA 31A2

14

12–16

< 0.001

 AO/OTA 31A3 and subtrochanteric

71

54–93

< 0.001

Surgeon experience > 3 years

0.9

0.8–1.0

0.05

 Academic hospital

1.2

1.1–1.4

0.009

 High-volume hospital (> 100 cases/year)

1.3

1.1–1.5

< 0.001

 Urban hospital

1.2

1.0–1.4

0.01

 Health region South-Eastern Norway

1

 Health region Western Norway

0.9

0.82–1.1

0.4

 Health region Central Norway

0.3

0.25–0.35

< 0.001

 Health region Northern Norway

0.7

0.52–0.83

< 0.001