condition mean min max ZT0-3 11.763100000000001 11.763100000000001 11.763100000000001 ZT4-7 10.373315 10.373315 10.373315 ZT8-11 9.25174 9.25174 9.25174 ZT12-15 9.001655 9.001655 9.001655 ZT16-19 11.324665 11.324665 11.324665 ZT20-23 12.0231 12.0231 12.0231