condition mean min max ZT0-3 5.068035 4.284225 5.851845 ZT4-7 3.5141099999999996 3.5141099999999996 3.5141099999999996 ZT8-11 5.74871 5.74871 5.74871 ZT12-15 0 0 0 ZT16-19 8.566565 8.566565 8.566565 ZT20-23 8.34915 8.34915 8.34915