condition mean min max ZT0-3 9.4473 9.4473 9.4473 ZT4-7 7.5974 7.5974 7.5974 ZT8-11 12.155999999999999 12.155999999999999 12.155999999999999 ZT12-15 9.640605 9.640605 9.640605 ZT16-19 13.763 13.763 13.763 ZT20-23 12.18185 12.18185 12.18185