condition mean min max ZT0-3 14.399929 14.399929 14.399929 ZT4-7 14.757497 14.757497 14.757497 ZT8-11 15.298269 15.298269 15.298269 ZT12-15 14.873823999999999 14.873823999999999 14.873823999999999 ZT16-19 18.1662315 18.1662315 18.1662315 ZT20-23 16.957706 16.957706 16.957706