condition mean min max ZT0-3 0.05520975 0.0441007 0.0663188 ZT4-7 0.0667655 0.0667655 0.0667655 ZT8-11 0.0218448 0.0218448 0.0218448 ZT12-15 0 0 0 ZT16-19 0.10868375 0.10868375 0.10868375 ZT20-23 0.02192935 0.02192935 0.02192935