condition mean min max ZT0-3 18.1768 15.325500000000002 21.028100000000002 ZT4-7 26.0026 26.0026 26.0026 ZT8-11 30.32695 30.32695 30.32695 ZT12-15 0 0 0 ZT16-19 31.82405 31.82405 31.82405 ZT20-23 27.67105 27.67105 27.67105