Dear all:    I used restricted cubic spline (RCS) to plot the mortality hazard ratio of body mass index. The hazard ratio was adjusted by age, viral type, SOFA score, and bicarbionate. However, there were two results of P-value for nonlinearity (Counts1 = 0.2264 and Counts2 = 0.6636). Which one should i use?     I used BMI=18.5 as the single knot. The following figure was the RCS plot.     ... View more