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Differences in waist gain (cm, mean and 95%CI) during follow-up (decreased activity: changed from upper third to a lower one; increased activity: changed from a lower third to upper one). A. Sex-specific differences among individuals taking into account clustered observation of twin pairs. B. Pairwise difference among leisure-time physical activity discordant same sex twin pairs. C. Pairwise differences among leisure-time physical activity discordant monozygotic twin pairs.
