condition mean min max ZT0-3 28.666725 25.838949999999997 31.494500000000002 ZT4-7 33.3858 33.3858 33.3858 ZT8-11 20.5199 20.5199 20.5199 ZT12-15 0 0 0 ZT16-19 31.182199999999998 31.182199999999998 31.182199999999998 ZT20-23 35.90565 35.90565 35.90565