condition mean min max ZT0-3 319.5 319.5 319.5 ZT4-7 271.4 271.4 271.4 ZT8-11 174.0 174.0 174.0 ZT12-15 212.64999999999998 212.64999999999998 212.64999999999998 ZT16-19 291.35 291.35 291.35 ZT20-23 230.79999999999998 230.79999999999998 230.79999999999998