condition mean min max ZT0-3 8.4710875 7.85048 9.091695 ZT4-7 4.09113 4.09113 4.09113 ZT8-11 9.26586 9.26586 9.26586 ZT12-15 0 0 0 ZT16-19 9.737079999999999 9.737079999999999 9.737079999999999 ZT20-23 9.449815000000001 9.449815000000001 9.449815000000001