condition mean min max ZT0-3 11.040895 9.78414 12.29765 ZT4-7 9.74003 9.74003 9.74003 ZT8-11 13.500350000000001 13.500350000000001 13.500350000000001 ZT12-15 0 0 0 ZT16-19 11.6797 11.6797 11.6797 ZT20-23 11.19765 11.19765 11.19765