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Biotrackr health data schema, metric extraction patterns, and analysis techniques for Fitbit activity data
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| name | health-data-analysis |
| description | Biotrackr health data schema, metric extraction patterns, and analysis techniques for Fitbit activity data |
Biotrackr health data arrives as a JSON object with an items array. Each item represents one day:
{
"items": [
{
"date": "2026-04-05",
"activity": {
"activities": [
{
"name": "Strength training",
"calories": 665,
"duration": 5271000,
"steps": 4972,
"startTime": "06:57",
"distance": 2.52
}
],
"summary": {
"steps": 15732,
"caloriesOut": 4049,
"activityCalories": 2341,
"fairlyActiveMinutes": 47,
"veryActiveMinutes": 78,
"lightlyActiveMinutes": 234,
"sedentaryMinutes": 567,
"distances": [{"activity": "total", "distance": 12.02}],
"floors": 238,
"restingHeartRate": 51
}
}
}
],
"totalCount": 7,
"note": "Optional note about missing data"
}
item["activity"]["summary"]["steps"]item["activity"]["summary"]["caloriesOut"]item["activity"]["summary"]["activityCalories"]fairlyActiveMinutes + veryActiveMinutes (combine both fields)distances array where activity == "total": next(d["distance"] for d in distances if d["activity"] == "total")item["activity"]["summary"]["floors"]item["activity"]["summary"]["restingHeartRate"]Activity durations in the data are in milliseconds. Convert to minutes by dividing by 60000:
duration_minutes = round(activity["duration"] / 60000)
Standard daily goals for achievement tracking:
| Goal | Target | Field |
|---|---|---|
| Steps | ≥ 10,000 | steps |
| Distance | ≥ 8.0 km | total distance |
| Active Minutes | ≥ 30 min | fairlyActiveMinutes + veryActiveMinutes |
| Calories | ≥ 2,500 kcal | caloriesOut |
Goal achievement per day = count of how many of the 4 goals were met.
Identify these standout categories across the reporting period:
max(days, key=lambda d: d["steps"])max(days, key=lambda d: d["caloriesOut"])max(days, key=lambda d: d["activeMinutes"])max(days, key=lambda d: d["goals_met"])duration across all daysCalculate these summary statistics:
note field indicates gaps).len(items)), not 7.