Use of the technique of counting numbers as a predictor of slow vital capacity in hospitalized individuals

PURPOSE:to evaluate if there is a correlation between the slow vital capacity and the maximum phonation time by technique of counting numbers and if it is possible from the maximum phonation time estimate the slow vital capacity in hospitalized individuals.METHODS:it is a cross-sectional study, crossover and choice of techniques (technique of numerical count and spirometry) were performed randomly (simple draw). The slow vital capacity was measured by spirometry and maximum phonation time was assessed using the technique of counting numbers.RESULTS:participated in the research 221 hospitalized patients. A positive correlation was observed between the Slow vital capacity and maximum phonation time evaluated on an absolute (r = 0.75; p <0.001) and relative (r = 0.76; p <0.001). From the simple linear regression of the data, were verified equations of the lines analyzed absolutely, Slow vital capacity = 55 Technique of numerical count + 735 (r2= 0,56; p < 0,0001) and relative Slow vital capacity = 0,84 Technique of numerical count + 14 (r2= 0,57; p < 0,0001).CONCLUSIONS:the results obtained in this study showed a good correlation between the techniques evaluated, possible to estimate the Slow vital capacity from the technique of counting numbers in hospitalized individuals.

研究目的：评估通过数数法测得的最大发声时间（Maximum Phonation Time）与缓慢肺活量（Slow Vital Capacity）之间是否存在相关性，以及能否在住院人群中通过最大发声时间估算缓慢肺活量。
研究方法：本研究为横断面交叉研究，采用简单随机抽样方式选取数数法与肺量计检测（spirometry）技术开展实验。缓慢肺活量通过肺量计检测进行测量，最大发声时间则采用数数法进行评估。
研究结果：共有221名住院患者参与本研究。在绝对值维度（r=0.75；p<0.001）与相对值维度（r=0.76；p<0.001）下，均观察到缓慢肺活量与最大发声时间之间存在显著正相关关系。通过对数据进行简单线性回归分析，得到两条回归方程：绝对值维度下，缓慢肺活量=55×数数法检测值+735（r²=0.56；p<0.0001）；相对值维度下，相对缓慢肺活量=0.84×数数法检测值+14（r²=0.57；p<0.0001）。
研究结论：本研究结果显示，两种检测技术间具有良好相关性，可通过数数法估算住院人群的缓慢肺活量。