Table 4.
The variable importance rankings demonstrated that calories burned during the basal metabolic rate (calories BMR) were the most predictive digital biomarker of the postpartum depression (PPD) class.
| Method and digital biomarker | Percentage ranked top 5 | Percentage ranked number 1 | |||
| SHAPa | |||||
|
|
Calories BMR | 100 | 85 | ||
|
|
Average HRb | 40 | 0 | ||
|
|
Quartile 1 HR | 40 | 0 | ||
|
|
Lightly active minutes | 35 | 10 | ||
|
|
Minimum HR | 35 | 0 | ||
|
|
Sedentary minutes | 0 | 10 | ||
|
|
Sum of steps | 0 | 10 | ||
| Permutation | |||||
|
|
Calories BMR | 100 | 100 | ||
|
|
Average HR | 65 | 0 | ||
|
|
Quartile 1 HR | 60 | 0 | ||
|
|
Minimum HR | 50 | 0 | ||
|
|
Lightly active minutes | 40 | 0 | ||
aSHAP: Shapley additive explanations.
bHR: heart rate.