condition mean min max ZT0-3 1.4950675 1.27985 1.710285 ZT4-7 1.2776445 1.2776445 1.2776445 ZT8-11 1.267915 1.267915 1.267915 ZT12-15 0 0 0 ZT16-19 2.1044045 2.1044045 2.1044045 ZT20-23 2.5350099999999998 2.5350099999999998 2.5350099999999998