condition mean min max ZT0-3 9.65 9.65 9.65 ZT4-7 4.8 4.8 4.8 ZT8-11 7.050000000000001 7.050000000000001 7.050000000000001 ZT12-15 7.9 7.9 7.9 ZT16-19 31.900000000000002 31.900000000000002 31.900000000000002 ZT20-23 9.45 9.45 9.45