condition mean min max ZT0-3 32.4 32.4 32.4 ZT4-7 36.5 36.5 36.5 ZT8-11 36.800000000000004 36.800000000000004 36.800000000000004 ZT12-15 65.05 65.05 65.05 ZT16-19 31.05 31.05 31.05 ZT20-23 7.65 7.65 7.65