To investigate whether the positive association between adult height and breast cancer is primarily due to an association with leg length, we tested whether the associations with leg length and sitting height were similar in a model including leg length and sitting height as well as covariates (Wald test).
Other studies have shown a positive association with childhood trunk length but not leg length (Whitley et al, 2009), no clear trend for neither leg length nor sitting height (Albanes et al, 1988) and no association with sitting height (Freni et al, 1996).
Once, as Espeseth reminisced at length about sitting with his three brothers in the front seat of his father's pickup truck on a fishing expedition, Renker had murmured, "Yes, yes, that's known as 'riding Mexican.' " Espeseth never confronted or corrected his shrink.
It also reduced total sitting time and the length of "sitting episodes" that last 30 minutes or longer, both at work and at home.
There was no statistical significant difference between the associations for leg length and sitting height (P=0.47).
We investigated the association further by decomposing height into leg length and sitting height.
The associations with breast cancer for leg length and sitting height were not significantly different (P=0.47).
The leg-to-sitting-height ratio was calculated by dividing leg length by sitting height, and multiplying by 100.
This method of estimating leg length from sitting height has been used previously in epidemiological studies (13 , 20.
Studies constructed curves for weight, height, weight/height, body mass index, head circumference, height velocity, leg length, and sitting height.
