condition mean min max ZT0-3 5.310272351249999 5.2115073249999995 5.4090373775 ZT4-7 5.468320684 4.83615973 6.100481638 ZT8-11 6.661738555333334 5.136237099000001 8.187240011666667 ZT12-15 7.731579073999999 5.8977162729999995 9.565441875 ZT16-19 8.314932125 8.230309819666667 8.399554430333334 ZT20-23 8.389273693666667 7.684758767333333 9.09378862