condition mean min max ZT0-3 23.355 20.9347 25.7753 ZT4-7 26.04655 26.04655 26.04655 ZT8-11 7.44323 7.44323 7.44323 ZT12-15 0 0 0 ZT16-19 10.807174999999999 10.807174999999999 10.807174999999999 ZT20-23 34.4264 34.4264 34.4264