condition mean min max ZT0-3 72.16303333333333 67.88295 74.4262 ZT4-7 76.51105 76.51105 76.51105 ZT8-11 70.13785 70.13785 70.13785 ZT12-15 62.519225000000006 60.1847 64.85375 ZT16-19 65.607 65.607 65.607 ZT20-23 64.5554 64.5554 64.5554