condition mean min max ZT0-3 2.718620605 2.372868354 3.0643728560000003 ZT4-7 2.67754124825 2.299664527 3.0554179694999997 ZT8-11 3.5128570375 2.4317273024999997 4.5939867725 ZT12-15 3.7945375175000002 3.256211059 4.3328639760000005 ZT16-19 2.9369687905 2.6070081055 3.2669294754999996 ZT20-23 3.4611465795 3.0254853504999994 3.8968078085