condition mean min max ZT0-3 13.661312500000001 12.255375 15.067250000000001 ZT4-7 9.17254 9.17254 9.17254 ZT8-11 9.126584999999999 9.126584999999999 9.126584999999999 ZT12-15 0 0 0 ZT16-19 6.694675 6.694675 6.694675 ZT20-23 4.656795000000001 4.656795000000001 4.656795000000001