condition mean min max ZT0-3 42.7 42.7 42.7 ZT4-7 6.5 6.5 6.5 ZT8-11 42.05 42.05 42.05 ZT12-15 65.05000000000001 65.05000000000001 65.05000000000001 ZT16-19 19.8 19.8 19.8 ZT20-23 23.1 23.1 23.1