Regression plots showing how the independent variables affect the SDNN (1st and 3rd row), and pDec and SDDec (2nd and 4th row) during KC. Columns reflect different independent variables, as annotated on the x-axes. The y-axes show the values of the HRV features after suitable transformation. Statistically significant (p-value < 0.05) variables are in red. The first two rows show those independent variables which were also incorporated into the HRV-model while the infant was in the incubator while the last two rows show additional Kangaroo care-related variables.