condition mean min max ZT0-3 6.050000000000001 6.050000000000001 6.050000000000001 ZT4-7 12.7 12.7 12.7 ZT8-11 34.3 34.3 34.3 ZT12-15 57.2 57.2 57.2 ZT16-19 16.0 16.0 16.0 ZT20-23 10.1 10.1 10.1