condition mean min max ZT0-3 39.676008 39.676008 39.676008 ZT4-7 40.375403500000004 40.375403500000004 40.375403500000004 ZT8-11 65.5494605 65.5494605 65.5494605 ZT12-15 62.06115 62.06115 62.06115 ZT16-19 78.841009 78.841009 78.841009 ZT20-23 71.53626249999999 71.53626249999999 71.53626249999999