condition mean min max ZT0-3 31.76045 31.59005 31.93085 ZT4-7 37.953599999999994 37.953599999999994 37.953599999999994 ZT8-11 36.95485 36.95485 36.95485 ZT12-15 0 0 0 ZT16-19 34.277249999999995 34.277249999999995 34.277249999999995 ZT20-23 38.202349999999996 38.202349999999996 38.202349999999996