condition mean min max ZT0-3 32.294919 32.294919 32.294919 ZT4-7 33.7565345 33.7565345 33.7565345 ZT8-11 26.5491655 26.5491655 26.5491655 ZT12-15 36.236576 36.236576 36.236576 ZT16-19 32.023469 32.023469 32.023469 ZT20-23 29.7332075 29.7332075 29.7332075