condition mean min max ZT0-3 20.3891 19.642049999999998 21.13615 ZT4-7 24.56625 24.56625 24.56625 ZT8-11 25.07385 25.07385 25.07385 ZT12-15 0 0 0 ZT16-19 42.63335 42.63335 42.63335 ZT20-23 33.852199999999996 33.852199999999996 33.852199999999996