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Table 5 Generalized linear regression model and a stepwise regression model for absolute ∆QTc (ms) between within-desaturation period and pre-desaturation in stroke and control population

From: QTc prolongation is associated with severe desaturations in stroke patients with sleep apnea

Generalized model

β

SE

T

p

Sex

0.578

0.774

0.747

0.455

Age (y)

0.049

0.037

1.310

0.190

TST (h)

 − 1.366

0.524

 − 2.591

0.010

AHI (1/h)

 − 0.031

0.018

 − 1.725

0.09

Desaturation duration (s)

0.065

0.022

2.978

0.002

∆SpO2 (%)

0.069

0.077

0.895

0.371

Stepwise model

β

SE

T

p

Sex

Age (y)

TST (h)

 − 1.549

0.457

 − 3.391

 < 0.001

AHI (1/h)

Desaturation duration (s)

0.080

0.021

3.818

 < 0.001

∆SpO2 (%)

  1. All other parameters except Desaturation duration and ∆SpO2 are treated patient-wise; the two are computed for each segment separately. The criteria for excluding parameters from the stepwise model was Deviance and p-value for F-statistics. Abbreviations: TST total sleep time, AHI apnea–hypopnea index, ∆SpO2 = depth of desaturation