Table 1 Comparison between patients and controls regarding electrophysiological data

Side

Patients phrenic DML, range (min-max)

Patients, mean ± SD

Control phrenic DML, range (min-max)

Controls, mean ± SD

t

P

 Rt phrenic

6.1–9.9

8.05 ± 1.2

6.1–8.1

7.01 ± 0.4

4.5

0.0001***

 Lt phrenic

6.6–9.8

7.89 ± 1.06

6.1–8.3

6.99 ± 0.399

4

0.0001***

Side

Patients phrenic amplitude, range (min-max)

Patients, mean ± SD

Controls phrenic amplitude, range (min-max)

Controls, mean ± SD

t

P

 Rt phrenic

281–543

411.6 ± 66.87

376–498

426.2 ± 39.37

− 1

0.15

 Lt phrenic

308–564

413.6 ± 61.61

378–480

427.5 ± 28.73

− 1.1

0.13