condition mean min max ZT0-3 12.545557 12.545557 12.545557 ZT4-7 10.0829245 10.0829245 10.0829245 ZT8-11 11.6045625 11.6045625 11.6045625 ZT12-15 10.872755000000002 10.872755000000002 10.872755000000002 ZT16-19 10.815862 10.815862 10.815862 ZT20-23 11.464891000000001 11.464891000000001 11.464891000000001