condition mean min max ZT0-3 14.3519 14.16095 14.54285 ZT4-7 14.504000000000001 14.504000000000001 14.504000000000001 ZT8-11 15.0379 15.0379 15.0379 ZT12-15 0 0 0 ZT16-19 19.9125 19.9125 19.9125 ZT20-23 17.126350000000002 17.126350000000002 17.126350000000002