condition mean min max ZT0-3 2.5035675 2.24488 2.7622549999999997 ZT4-7 3.40925 3.40925 3.40925 ZT8-11 5.66974 5.66974 5.66974 ZT12-15 0 0 0 ZT16-19 5.144765 5.144765 5.144765 ZT20-23 3.4676299999999998 3.4676299999999998 3.4676299999999998