condition mean min max ZT0-3 12.23605 10.38685 14.08525 ZT4-7 12.895399999999999 12.895399999999999 12.895399999999999 ZT8-11 13.8518 13.8518 13.8518 ZT12-15 0 0 0 ZT16-19 23.591749999999998 23.591749999999998 23.591749999999998 ZT20-23 16.0786 16.0786 16.0786