condition mean min max ZT0-3 253.078211 253.078211 253.078211 ZT4-7 135.47387500000002 135.47387500000002 135.47387500000002 ZT8-11 168.220804 168.220804 168.220804 ZT12-15 227.750222 227.750222 227.750222 ZT16-19 355.850109 355.850109 355.850109 ZT20-23 350.390556 350.390556 350.390556