condition mean min max ZT0-3 0.7936000000000001 0.2504115 1.8428300000000002 ZT4-7 1.689445 1.689445 1.689445 ZT8-11 0.7269235000000001 0.7269235000000001 0.7269235000000001 ZT12-15 0.4864615 0.3494265 0.6234965 ZT16-19 0.352655 0.352655 0.352655 ZT20-23 0.256011 0.256011 0.256011