| ATC | Anatomical Therapeutic Chemical |
| BMI | Body mass index |
| ISCED | International Standard Classification of Education |
| MVPA | Moderate-to-vigorous physical activity |
| OA1 | OUTDOOR ACTIVE pilot study |
| OA2 | OUTDOOR ACTIVE cluster-randomized controlled trial |
| OG 1 | Low risk of osteoporosis |
| OG 2 | High risk of osteoporosis |
| OG 3 | Diagnosis of osteoporosis |
| OST | Osteoporosis Self-Assessment Tool |
| WHO | World Health Organization |
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