condition mean min max ZT0-3 208.519546 208.519546 208.519546 ZT4-7 314.4405805 314.4405805 314.4405805 ZT8-11 296.8275685 296.8275685 296.8275685 ZT12-15 315.7662685 315.7662685 315.7662685 ZT16-19 240.041626 240.041626 240.041626 ZT20-23 263.475954 263.475954 263.475954