condition mean min max ZT0-3 12.145001666666666 10.5878 14.54375 ZT4-7 8.397825000000001 8.397825000000001 8.397825000000001 ZT8-11 9.204245 9.204245 9.204245 ZT12-15 13.3151 13.094899999999999 13.5353 ZT16-19 10.443855 10.443855 10.443855 ZT20-23 17.042749999999998 17.042749999999998 17.042749999999998