Table 3 Data used for calculation of the Number Needed to Treat in case of predicted unstable and stable TFF based on rLWT and aLWT.

From: Relative lateral wall thickness is an improved predictor for postoperative lateral wall fracture after trochanteric femoral fracture osteosynthesis

Predicted unstable TFF

Predicted stable TFF

Parameter and range

Patients without sLWF (n)

Patients with sLWF (n)

Parameter and range

Patients without sLWF (n)

Patients with sLWF (n)

rLWT < 50.5%

30 (a)

35 (c)

rLWT > 50.5%

130 (a)

7 (c)

aLWT < 20.5 mm

26 (b)

32 (d)

aLWT > 20.5 mm

140 (b)

10 (d)

Number Needed to Treat = 75

Number Needed to Treat = 64

  1. Number Needed to Treat = 1/absolute risk reduction. Absolute risk reduction = d/(b + d) − c/(a + c).
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