condition mean min max ZT0-3 8.974355 8.974355 8.974355 ZT4-7 10.187614499999999 10.187614499999999 10.187614499999999 ZT8-11 9.8168685 9.8168685 9.8168685 ZT12-15 9.339803499999999 9.339803499999999 9.339803499999999 ZT16-19 9.680644999999998 9.680644999999998 9.680644999999998 ZT20-23 10.6631175 10.6631175 10.6631175