condition mean min max ZT0-3 13.0794 12.6525 13.5063 ZT4-7 22.144750000000002 22.144750000000002 22.144750000000002 ZT8-11 20.29385 20.29385 20.29385 ZT12-15 0 0 0 ZT16-19 13.8975 13.8975 13.8975 ZT20-23 14.6766 14.6766 14.6766