condition mean min max ZT0-3 15.481985803333334 14.111799106666666 16.8521725 ZT4-7 14.569496138333335 12.943893383333334 16.195098893333334 ZT8-11 15.087193285000001 14.84286387 15.3315227 ZT12-15 17.399807725 14.96414924 19.83546621 ZT16-19 17.737454708333335 16.5106621 18.96424731666667 ZT20-23 17.295354144999997 16.18021353 18.41049476