condition mean min max ZT0-3 33.51638373 27.56486954 39.46789792 ZT4-7 20.4430121225 18.721422920000002 22.164601325 ZT8-11 25.637151227500002 21.94858517 29.325717285000003 ZT12-15 33.5043811875 32.370538769999996 34.638223605 ZT16-19 45.1065823175 43.347874305000005 46.86529033 ZT20-23 51.22960003 48.91937696 53.53982310000001