condition mean min max ZT0-3 479.9 479.9 479.9 ZT4-7 279.4 279.4 279.4 ZT8-11 246.89999999999998 246.89999999999998 246.89999999999998 ZT12-15 338.4 338.4 338.4 ZT16-19 330.20000000000005 330.20000000000005 330.20000000000005 ZT20-23 368.9 368.9 368.9