condition mean min max ZT0-3 4.6478982085 4.0573344460000005 5.2384619709999996 ZT4-7 3.37995523525 3.1268115720000003 3.6330988985 ZT8-11 6.4590638689999995 4.6891259315 8.2290018065 ZT12-15 10.89519154325 7.4782096055 14.312173481 ZT16-19 5.443736091 5.333811116 5.553661066 ZT20-23 8.3277416935 7.366671832 9.288811555