condition mean min max ZT0-3 107.664249 107.664249 107.664249 ZT4-7 125.9228885 125.9228885 125.9228885 ZT8-11 153.2503835 153.2503835 153.2503835 ZT12-15 100.9864475 100.9864475 100.9864475 ZT16-19 125.69225 125.69225 125.69225 ZT20-23 128.9670035 128.9670035 128.9670035