condition mean min max ZT0-3 30.8 30.8 30.8 ZT4-7 33.4 33.4 33.4 ZT8-11 69.1 69.1 69.1 ZT12-15 84.69999999999999 84.69999999999999 84.69999999999999 ZT16-19 59.05 59.05 59.05 ZT20-23 65.0 65.0 65.0