condition mean min max ZT0-3 3.4351025 2.83734 4.032865 ZT4-7 6.752705 6.752705 6.752705 ZT8-11 3.5171 3.5171 3.5171 ZT12-15 0 0 0 ZT16-19 4.143625 4.143625 4.143625 ZT20-23 7.988105000000001 7.988105000000001 7.988105000000001