condition mean min max ZT0-3 7.63298 7.63298 7.63298 ZT4-7 7.872574999999999 7.872574999999999 7.872574999999999 ZT8-11 12.0537 12.0537 12.0537 ZT12-15 9.448364999999999 9.448364999999999 9.448364999999999 ZT16-19 12.047 12.047 12.047 ZT20-23 7.1815999999999995 7.1815999999999995 7.1815999999999995