2.2 Comparison of pulse oscillation parameters in children of different ages and genders
First compared different age children IOS related parameter values, the results showed that there was no significant difference in the main parameters of IOS between the same age and different gender groups, but there was significant difference among different age groups. The values of Zrs, Fres, R5 and R20 decreased with age, while X5 increased with age (Table 2).
2.3 The relationship between IOS parameters and height, weight, age, and gender of children
Further compare different height children IOS related parameter values, it is found that the same height, no obvious difference was found between different genders IOS parameters, and different height has the obvious difference (see Figure 1), line further correlation analysis results show that both boy and girl, with high increase of Z5, Fres, R5, and R20are dwindling, and negatively correlated with height, and X5 with the increase of height, increased gradually, and is closely relative to height (Figure 1 and table 3). Multiple stepwise regression analysis further proved that although IOS parameters were related to height, age, and weight, most IOS parameters were most closely related to height (with the largest R value), followed by age and weight.
2.4 IOS main parameter prediction equation
By multiple stepwise regression analysis to age (A), height (H), weight (W) as the independent variables of the equation of R5, R20, X5, Z5, and Fres of IOS related parameters as the dependent variable, work out different gender IOS related parameters of the regression equation (see table 4).