condition mean min max ZT0-3 20.111800000000002 20.111800000000002 20.111800000000002 ZT4-7 16.79815 16.79815 16.79815 ZT8-11 13.4768 13.4768 13.4768 ZT12-15 11.33155 11.33155 11.33155 ZT16-19 17.33865 17.33865 17.33865 ZT20-23 17.90495 17.90495 17.90495