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Thorax 54:790-795 doi:10.1136/thx.54.9.790
  • Original article

The open circuit nitrogen washout technique for measuring the lung volume in infants: methodological aspects

Table 1

Accuracy study: measurement of known air volumes by nitrogen washout

Known volume
(ml) 		Measured volume
(ml) 		Error (%)
42 41.8  (0.4)1-151 −0.47
92 92.2 (0.6) 0.22
142 141.9 (1.1) −0.07
192 191.1 (1.2) 0.46
242 242.4 (1.9) −0.16
292 290.9 (1.4) −0.37
342 341.6 (1.8) −0.11
392 391.9 (2.6) −0.02
442 442.8 (2.9) −0.18
492 490.4 (1.4) −0.32
−0.10  (0.28)1-150

  • ↵1-150 Mean (SD).

  • ↵1-151 Values are mean (SD) of five measurements performed randomly over a 14 hour period.

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