condition mean min max ZT0-3 30.1 30.1 30.1 ZT4-7 16.1 16.1 16.1 ZT8-11 18.65 18.65 18.65 ZT12-15 15.600000000000001 15.600000000000001 15.600000000000001 ZT16-19 45.3 45.3 45.3 ZT20-23 54.65 54.65 54.65