Summary Table Oxford Level of Evidence 15 09/01/2018 1. Ib , mixed 2. Ib , mixed; Ib , knee 3. Ib , hip; Ib , knee 4. Ib , mixed; Ib , knee 5. Ia , mixed 6. Ia , knee, delivery mode; Ia , mixed, water-based exercise 7. Ia , hip, overall exercise; Ia , knee, overall exercise; Ia , knee, strength; Ia , knee, aerobic; Ia , mixed, mixed programmes 8. III, hip; Ia , knee 9. Ib , knee. 10. III, hip; III, knee 11. III, hip; III, knee; Ib , mixed, sick leave