condition mean min max ZT0-3 15.005479 15.005479 15.005479 ZT4-7 11.932893499999999 11.932893499999999 11.932893499999999 ZT8-11 12.618962 12.618962 12.618962 ZT12-15 11.30113 11.30113 11.30113 ZT16-19 13.464248000000001 13.464248000000001 13.464248000000001 ZT20-23 12.606488500000001 12.606488500000001 12.606488500000001