condition mean min max ZT0-3 267.187 267.187 267.187 ZT4-7 260.481 260.481 260.481 ZT8-11 139.39350000000002 139.39350000000002 139.39350000000002 ZT12-15 123.6125 123.6125 123.6125 ZT16-19 187.75549999999998 187.75549999999998 187.75549999999998 ZT20-23 253.68599999999998 253.68599999999998 253.68599999999998