condition mean min max ZT0-3 12.710620836 4.122891212 21.29835046 ZT4-7 7.609448047 4.9770143355 10.2418817585 ZT8-11 17.282316875 14.52165827 20.042975480000003 ZT12-15 39.2858569 33.877391505 44.694322295000006 ZT16-19 38.0004570075 36.45587664 39.545037375 ZT20-23 34.0099402425 33.97857328 34.041307205