condition mean min max ZT0-3 0.03693985 0.03693985 0.03693985 ZT4-7 0.0510135 0.0510135 0.0510135 ZT8-11 0.222402 0.222402 0.222402 ZT12-15 0.5242819999999999 0.5242819999999999 0.5242819999999999 ZT16-19 0.448507 0.448507 0.448507 ZT20-23 0.02228265 0.02228265 0.02228265