condition mean min max ZT0-3 1.9268900000000002 1.215095 2.638685 ZT4-7 0.060442 0.060442 0.060442 ZT8-11 0.4939695 0.4939695 0.4939695 ZT12-15 0 0 0 ZT16-19 0.723213 0.723213 0.723213 ZT20-23 0.424671 0.424671 0.424671