condition mean min max ZT0-3 26.178138 26.178138 26.178138 ZT4-7 20.748355500000002 20.748355500000002 20.748355500000002 ZT8-11 24.467610999999998 24.467610999999998 24.467610999999998 ZT12-15 39.905508499999996 39.905508499999996 39.905508499999996 ZT16-19 37.988367 37.988367 37.988367 ZT20-23 100.70478399999999 100.70478399999999 100.70478399999999