condition mean min max ZT0-3 34.2 34.2 34.2 ZT4-7 14.6 14.6 14.6 ZT8-11 11.65 11.65 11.65 ZT12-15 5.35 5.35 5.35 ZT16-19 34.800000000000004 34.800000000000004 34.800000000000004 ZT20-23 14.9 14.9 14.9