condition mean min max ZT0-3 0.3313045 0.0 0.9939135 ZT4-7 0.8616824999999999 0.8616824999999999 0.8616824999999999 ZT8-11 0.0 0.0 0.0 ZT12-15 1.781723 1.028531 2.534915 ZT16-19 0.368031 0.368031 0.368031 ZT20-23 2.09589 2.09589 2.09589