condition mean min max ZT0-3 5.189428333333334 4.152715 6.493755 ZT4-7 2.47548 2.47548 2.47548 ZT8-11 5.173535 5.173535 5.173535 ZT12-15 7.47961 7.47565 7.48357 ZT16-19 7.1508 7.1508 7.1508 ZT20-23 7.500875 7.500875 7.500875