condition mean min max ZT0-3 1.2010352499999999 1.0632955 1.338775 ZT4-7 1.15402 1.15402 1.15402 ZT8-11 0.8881465 0.8881465 0.8881465 ZT12-15 0 0 0 ZT16-19 1.044998 1.044998 1.044998 ZT20-23 1.12253 1.12253 1.12253