condition mean min max ZT0-3 32.225723 32.225723 32.225723 ZT4-7 34.522638 34.522638 34.522638 ZT8-11 23.398799 23.398799 23.398799 ZT12-15 25.533223 25.533223 25.533223 ZT16-19 16.518016 16.518016 16.518016 ZT20-23 21.1441385 21.1441385 21.1441385