condition mean min max ZT0-3 13.763333332333334 13.763333332333334 13.763333332333334 ZT4-7 13.345 13.345 13.345 ZT8-11 13.245000000000001 13.245000000000001 13.245000000000001 ZT12-15 11.79111111 11.79111111 11.79111111 ZT16-19 7.934444444333334 7.934444444333334 7.934444444333334 ZT20-23 12.629999999999999 12.629999999999999 12.629999999999999