condition mean min max ZT0-3 9.819295 9.321545 10.317045 ZT4-7 4.793265 4.793265 4.793265 ZT8-11 5.2119800000000005 5.2119800000000005 5.2119800000000005 ZT12-15 0 0 0 ZT16-19 6.7279 6.7279 6.7279 ZT20-23 9.439645 9.439645 9.439645