condition mean min max ZT0-3 23.972324999999998 23.913 24.03165 ZT4-7 29.0481 29.0481 29.0481 ZT8-11 28.418750000000003 28.418750000000003 28.418750000000003 ZT12-15 0 0 0 ZT16-19 30.36755 30.36755 30.36755 ZT20-23 31.34615 31.34615 31.34615