condition mean min max ZT0-3 0.710252 0.710252 0.710252 ZT4-7 0.9987215 0.9987215 0.9987215 ZT8-11 1.474615 1.474615 1.474615 ZT12-15 1.350105 1.350105 1.350105 ZT16-19 0.767545 0.767545 0.767545 ZT20-23 1.087626 1.087626 1.087626