condition mean min max ZT0-3 7.378959999999999 7.378959999999999 7.378959999999999 ZT4-7 4.739890000000001 4.739890000000001 4.739890000000001 ZT8-11 4.90673 4.90673 4.90673 ZT12-15 7.121790000000001 7.121790000000001 7.121790000000001 ZT16-19 7.470915 7.470915 7.470915 ZT20-23 7.0027 7.0027 7.0027