condition mean min max ZT0-3 0.6976195 0.4718715 1.0780355 ZT4-7 0.326141 0.326141 0.326141 ZT8-11 0.431757 0.431757 0.431757 ZT12-15 0.93224675 0.4768675 1.387626 ZT16-19 1.0224695 1.0224695 1.0224695 ZT20-23 1.3501699999999999 1.3501699999999999 1.3501699999999999