condition mean min max ZT0-3 10.953188 10.953188 10.953188 ZT4-7 9.742602 9.742602 9.742602 ZT8-11 10.450396 10.450396 10.450396 ZT12-15 10.136387 10.136387 10.136387 ZT16-19 10.841637500000001 10.841637500000001 10.841637500000001 ZT20-23 11.7650545 11.7650545 11.7650545