condition mean min max ZT0-3 3.52628 3.032905 4.019655 ZT4-7 3.83645 3.83645 3.83645 ZT8-11 1.622035 1.622035 1.622035 ZT12-15 0 0 0 ZT16-19 2.2977350000000003 2.2977350000000003 2.2977350000000003 ZT20-23 3.8073300000000003 3.8073300000000003 3.8073300000000003