condition mean min max ZT0-3 12.830038 12.830038 12.830038 ZT4-7 12.471629499999999 12.471629499999999 12.471629499999999 ZT8-11 13.0256065 13.0256065 13.0256065 ZT12-15 12.228660999999999 12.228660999999999 12.228660999999999 ZT16-19 13.4964285 13.4964285 13.4964285 ZT20-23 11.208205 11.208205 11.208205