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Table 4 Relationship between diaphragm movements and prediction of postoperative FEV 1

From: Diaphragm motion and lung function prediction in patients operated for lung cancer – a pilot study on 27 patients

  Pearson correlation p t-test for equation of means
t df Sig. (2-tailed)
A1 ipsilateral (Rtg) - 0.15 0.46 0.70 23 0.48
A1 ipsilateral (US) 0.028 0.89 0.12 23 0.90
ΔA ipsilateral (Rtg) - 0.15/0.97* 0.71/0.006* - 0.90 6 0.40
ΔA ipsilateral (US) 0.19 0.46 - 0.84 14 0.41
Δa ipsilateral inspirium - 0.09 0.72 0.33 16 0.74
Δa ipsilateral inspiriumn (%) - 0.16 0.52 0.44 16 0.66
A1(%) - 0.23/ -0.84#/ -0.91§ 0.27/ 0.03#/ 0.03§ 0.90 22 0.37
A2(%) - 0.016 0.96 - 1.56 7 0.16
height 0.43 0.02    
weight 0.24 0.23    
  1. A1 ipsilateral (Rtg): preoperative amplitude of the ipsilateral diaphragm measured radiographically; A1 ipsilateral (US): the same amplitude measured ultrasonographically; ΔA ipsilateral (Rtg): difference between the preoperative and postoperative amplitudes measured radiographically; ΔA ipsilateral (US): the same difference measured ultrasonographically; Δa ipsilateral inspirium.: difference between preoperative and postoperative value of the apex-diaphragm dome distance in deep inspiration; Δa ipsilateral insp (%):Δa ipsilateral insp expressed as a% of the apex-diaphragm dome distance in deep inspiration; A1(%): the preoperative ipsilateral diaphragm amplitude as a percentage of the preoperative apex-diaphragm dome distance in inspiration; A2(%): the postoperative ipsilateral diaphragm amplitude as a percentage of the preoperative apex-diaphragm dome distance in inspiration; *: right sided tumours; #: left sided tumours; §: cut-off value of 550 ml for the differences between ppo FEV1 and actual FEV1.