condition mean min max ZT0-3 4.7807765595 4.634641471 4.926911648 ZT4-7 4.971354452 4.896067201 5.046641703000001 ZT8-11 4.95549826425 4.027884765 5.8831117635000005 ZT12-15 6.1008094805 5.010539231499999 7.1910797295 ZT16-19 6.4969213775 6.3440927795 6.6497499755 ZT20-23 8.7814011295 7.659343028 9.903459231000001