condition mean min max ZT0-3 1.3811417499999998 1.31801 1.4442735 ZT4-7 1.77416 1.77416 1.77416 ZT8-11 1.62902 1.62902 1.62902 ZT12-15 0 0 0 ZT16-19 5.032275 5.032275 5.032275 ZT20-23 2.525505 2.525505 2.525505