condition mean min max ZT0-3 10.403970000000001 10.403970000000001 10.403970000000001 ZT4-7 6.9893149999999995 6.9893149999999995 6.9893149999999995 ZT8-11 11.20313 11.20313 11.20313 ZT12-15 13.14125 13.14125 13.14125 ZT16-19 11.679400000000001 11.679400000000001 11.679400000000001 ZT20-23 11.7041 11.7041 11.7041