condition mean min max ZT0-3 0.608654 0.4052855 0.8120225 ZT4-7 0.40681900000000004 0.40681900000000004 0.40681900000000004 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.599441 0.599441 0.599441 ZT20-23 0.0 0.0 0.0