condition mean min max ZT0-3 194.923586 194.923586 194.923586 ZT4-7 360.57285950000005 360.57285950000005 360.57285950000005 ZT8-11 328.152416 328.152416 328.152416 ZT12-15 240.92307799999998 240.92307799999998 240.92307799999998 ZT16-19 237.78963199999998 237.78963199999998 237.78963199999998 ZT20-23 235.635119 235.635119 235.635119