condition mean min max ZT0-3 86.65 86.65 86.65 ZT4-7 60.7 60.7 60.7 ZT8-11 89.85 89.85 89.85 ZT12-15 188.7 188.7 188.7 ZT16-19 161.39999999999998 161.39999999999998 161.39999999999998 ZT20-23 127.9 127.9 127.9