condition mean min max ZT0-3 20.570117 20.570117 20.570117 ZT4-7 11.5410635 11.5410635 11.5410635 ZT8-11 12.15138 12.15138 12.15138 ZT12-15 14.1043965 14.1043965 14.1043965 ZT16-19 10.923585 10.923585 10.923585 ZT20-23 13.519639000000002 13.519639000000002 13.519639000000002