Table 3

Difference between admission and discharge of measured physiological variables in 30 patients either readmitted (n=9) or not readmitted (n=21) within 14 days of hospital discharge

∆MEWS*∆FEV1Previous admissions*∆EMGpara%max∆NRDI
Readmitted0 (−1–2)0.09±0.154 (0–14)1.98±4.3676±134
Not readmitted0 (−3–2)0.08±0.103 (0–10)−4.05±10.30−127±305
Mean difference (95% CI)0.1 (0.14 to 0.11)6.03 (11.5 to 0.54)203 (39 to 366)
p Value0.
  • Data presented as mean±SD or *median (range).

  • Seven patients were unable to perform spirometry on two occasions so analysis of FEV1 was performed on readmitted (n=6) and not readmitted (n=17).

  • EMGpara%max, EMGpara during tidal breathing normalised for maximum EMGpara produced during a sniff manoeuvre; EMGpara, parasternal electromyogram activity; FEV1, forced expiratory volume in 1 s; MEWS, medical early warning score; NRDI, neural respiratory drive index (respiratory rate × EMGpara%max).