condition mean min max ZT0-3 23.814149999999998 23.814149999999998 23.814149999999998 ZT4-7 15.638850000000001 15.638850000000001 15.638850000000001 ZT8-11 12.0626 12.0626 12.0626 ZT12-15 13.0967 13.0967 13.0967 ZT16-19 18.3288 18.3288 18.3288 ZT20-23 22.54665 22.54665 22.54665