condition mean min max ZT0-3 25.525266 25.525266 25.525266 ZT4-7 36.2045095 36.2045095 36.2045095 ZT8-11 64.5726075 64.5726075 64.5726075 ZT12-15 60.970199 60.970199 60.970199 ZT16-19 38.956576 38.956576 38.956576 ZT20-23 17.5621175 17.5621175 17.5621175