condition mean min max ZT0-3 63.14265 63.14265 63.14265 ZT4-7 59.0203 59.0203 59.0203 ZT8-11 44.29275 44.29275 44.29275 ZT12-15 37.9302 37.9302 37.9302 ZT16-19 46.5287 46.5287 46.5287 ZT20-23 56.067750000000004 56.067750000000004 56.067750000000004