condition mean min max ZT0-3 152.91912732 127.85961314 177.9786415 ZT4-7 19.28155490675 15.18658534 23.376524473499998 ZT8-11 24.14503096 17.39871723 30.891344690000004 ZT12-15 30.608297515 26.969760815 34.246834215 ZT16-19 42.936224705 38.47501617 47.39743324 ZT20-23 61.7377023625 55.749481020000005 67.725923705