condition mean min max ZT0-3 5.111525 2.111965 10.22438 ZT4-7 12.156500000000001 12.156500000000001 12.156500000000001 ZT8-11 8.05585 8.05585 8.05585 ZT12-15 25.949324999999998 24.126849999999997 27.7718 ZT16-19 9.943925 9.943925 9.943925 ZT20-23 2.935145 2.935145 2.935145