condition mean min max ZT0-3 57.5219776 50.06618656 64.97776864 ZT4-7 41.303646244999996 35.6244137 46.98287879 ZT8-11 14.9437051705 10.47283415 19.414576191 ZT12-15 9.516620063249999 7.3856633899999995 11.6475767365 ZT16-19 22.856272347500003 19.79264255 25.919902145000002 ZT20-23 34.369664990000004 33.585202975 35.154127005