condition mean min max ZT0-3 24.150000000000002 24.150000000000002 24.150000000000002 ZT4-7 10.5 10.5 10.5 ZT8-11 7.8500000000000005 7.8500000000000005 7.8500000000000005 ZT12-15 34.2 34.2 34.2 ZT16-19 21.25 21.25 21.25 ZT20-23 45.65 45.65 45.65