condition mean min max ZT0-3 5.3770388275 3.17796753 7.576110125 ZT4-7 11.77143816525 9.828933700499999 13.71394263 ZT8-11 9.6440605875 8.715624373 10.572496802 ZT12-15 3.35970565175 2.5268576195000003 4.192553684 ZT16-19 3.87554238725 3.3926497255 4.358435049 ZT20-23 4.04225693025 3.67999245 4.4045214105