condition mean min max ZT0-3 4.475960000000001 4.475960000000001 4.475960000000001 ZT4-7 3.365545 3.365545 3.365545 ZT8-11 2.73037 2.73037 2.73037 ZT12-15 3.29249 3.29249 3.29249 ZT16-19 5.422280000000001 5.422280000000001 5.422280000000001 ZT20-23 4.67258 4.67258 4.67258