|No. of participants (No. of studies)||Design||Quality assessment||Absolute effect||Quality|
|Risk of bias||Inconsistency||Indirectness||Imprecision|
|The mean age was 4.4 years. Data were collected cross-sectionally. Bone and skeletal health were assessed objectively using quantitative ultrasound.|
|1512 (1)||Cross-sectionala||Serious risk of biasb||No serious inconsistency||No serious indirectness||Serious imprecisionc||
Objectively measured sedentary time:
After adjusting for MVPA, accelerometer-derived sedentary time was no longer significantly associated with bone stiffness index (SI) in preschool children (β = -0.37; R2 = 19%; p = 0.28) .
Screen-based sedentary behaviours:
There was no association between parent-reported screen time and SI (β = −0.04; R2 = 18.4%; p = 0.50) .