condition mean min max ZT0-3 0.0243066 0.0242686 0.0243446 ZT4-7 0.02476115 0.02476115 0.02476115 ZT8-11 0.1209067 0.1209067 0.1209067 ZT12-15 0 0 0 ZT16-19 0.0238669 0.0238669 0.0238669 ZT20-23 0.0239337 0.0239337 0.0239337