condition mean min max ZT0-3 3.7916800000000004 3.7916800000000004 3.7916800000000004 ZT4-7 3.64657 3.64657 3.64657 ZT8-11 3.405685 3.405685 3.405685 ZT12-15 3.040015 3.040015 3.040015 ZT16-19 4.1586 4.1586 4.1586 ZT20-23 3.37179 3.37179 3.37179