condition mean min max ZT0-3 41.0948 38.2329 43.9567 ZT4-7 35.52575 35.52575 35.52575 ZT8-11 46.519149999999996 46.519149999999996 46.519149999999996 ZT12-15 0 0 0 ZT16-19 58.0995 58.0995 58.0995 ZT20-23 36.82645 36.82645 36.82645