Table 3

Student's t tests of anthropometric and airways measures between participant groups

Non-ventilatory failure group
n=31
Ventilatory failure group
n=15
t-Statistic (df)Difference between meansPercentage of differencep Value of t-statistic
Age (years)53.2 (9.5)54.6 (8.1)0.492 (44)+1.41+2.650.625
Weight (kg)130.6 (29.4)153.3 (36.8)2.256 (44)+22.7+17.30.029*
BMI (kg)45.1 (9.1)53.0 (12.3)2.201 (21.7)†+7.9+17.50.039*
R5 seated0.50 (0.22)0.58 (0.16)1.325 (44)+0.083+16.80.192
R20 Seated0.33 (0.14)0.35 (0.10)0.538 (44)+0.021+6.450.593
R5–R20 seated0.167 (0.12)0.22 (0.12)1.645 (44)+0.062+37.60.107
R5 supine0.64 (0.20)0.79 (0.24)2.253 (44)+0.15+23.60.029*
R20 supine0.40 (0.12)0.46 (0.10)2.016 (44)+0.070+17.70.05
R5–R20 supine0.24 (0.13)0.32 (0.19)1.488 (20.05)†+0.080+33.10.152
  • *p<0.05. Data are presented as mean values with SDs in brackets.

  • †Levene's Test for homogeneity of variances violated (p<0.05), therefore t test not assuming equal variances performed.

  • R5, overall airways resistance; R20, large airways resistance; R5–R20, small airways resistance; BMI, body mass index.