condition mean min max ZT0-3 23.524964 23.524964 23.524964 ZT4-7 26.291110500000002 26.291110500000002 26.291110500000002 ZT8-11 24.011715000000002 24.011715000000002 24.011715000000002 ZT12-15 26.509864999999998 26.509864999999998 26.509864999999998 ZT16-19 33.0115895 33.0115895 33.0115895 ZT20-23 34.7766255 34.7766255 34.7766255