condition mean min max ZT0-3 387.979188 387.979188 387.979188 ZT4-7 331.564616 331.564616 331.564616 ZT8-11 346.755621 346.755621 346.755621 ZT12-15 349.02015500000005 349.02015500000005 349.02015500000005 ZT16-19 271.089852 271.089852 271.089852 ZT20-23 316.91249100000005 316.91249100000005 316.91249100000005