condition mean min max ZT0-3 28.242353 28.242353 28.242353 ZT4-7 24.356275 24.356275 24.356275 ZT8-11 26.813692 26.813692 26.813692 ZT12-15 25.5569535 25.5569535 25.5569535 ZT16-19 24.182798 24.182798 24.182798 ZT20-23 24.5677665 24.5677665 24.5677665