condition mean min max ZT0-3 5.95705 5.95705 5.95705 ZT4-7 3.8494 3.8494 3.8494 ZT8-11 3.161365 3.161365 3.161365 ZT12-15 5.485365 5.485365 5.485365 ZT16-19 7.0824 7.0824 7.0824 ZT20-23 6.15889 6.15889 6.15889