condition mean min max ZT0-3 7.4588275 7.3352450000000005 7.582409999999999 ZT4-7 8.011054999999999 8.011054999999999 8.011054999999999 ZT8-11 7.326235 7.326235 7.326235 ZT12-15 0 0 0 ZT16-19 9.09058 9.09058 9.09058 ZT20-23 9.49465 9.49465 9.49465