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Table 3 Comparison of patients with an outcome in the registry to patients lacking an outcome

From: A cohort study of 4,190 patients treated with low-intensity pulsed ultrasound (LIPUS): findings in the elderly versus all patients

 

Outcome (± SD)

N or %

No outcome (± SD)

N or %

Significance

Patient age (years)

43.3 (±18.1)

4,157

41.4 (±17.9)

1,539

0.0004

Weight (lb)

170.5 (±43.0)

3,296

176.5 (±55.8)

1,030

0.002

Height (in)

67.9 (±4.7)

3,309

68.4 (±4.4)

1,031

0.0004

Body-mass index

25.9 (±5.5)

3,278

26.4 (±7.8)

1,021

NS

Days-to-treatment (mean)

38.6 (±24.5)

4,170

39.6 (±25.3)

1,567

NS

Days-on-treatment (mean)

118.5 (±86.0)

4,190

116.4 (±107.0)

1,561

NS

Female (vs. male) (%)**

1,745 (vs. 2,441)

41.7%

599 (vs. 957)

38.5%

NS

Open (vs. closed fracture) (%)**

710 (vs. 3,320)

17.6%

243 (vs. 1,245)

16.3%

NS

Number of prior procedures (mean)

1.5 (±0.8)

991

1.4 (±0.7)

368

NS

Number of comorbidities (mean)

1.4 (±0.7)

763

1.5 (±0.9)

250

NS

Number of medications (mean)

0.4 (±0.7)

2,747

0.4 (±0.6)

755

NS

Smoking years (mean)

5.1 (±10.6)

3,183

6.6 (±11.3)

1,041

0.0002

  1. This approach should be very sensitive to risk factors that increase the risk of loss to follow-up. The p values shown are from T-tests, except for comparisons with an asterisk (**), which were tested using Fischer’s exact test because they are dichotomous variables.