condition mean min max ZT0-3 20.44455 15.839550000000001 22.83715 ZT4-7 14.951600000000001 14.951600000000001 14.951600000000001 ZT8-11 12.622499999999999 12.622499999999999 12.622499999999999 ZT12-15 18.52625 15.9895 21.063000000000002 ZT16-19 20.9169 20.9169 20.9169 ZT20-23 24.3639 24.3639 24.3639