condition mean min max ZT0-3 10.013715000000001 10.013715000000001 10.013715000000001 ZT4-7 5.631410000000001 5.631410000000001 5.631410000000001 ZT8-11 6.665915 6.665915 6.665915 ZT12-15 10.1897 10.1897 10.1897 ZT16-19 16.356099999999998 16.356099999999998 16.356099999999998 ZT20-23 14.981 14.981 14.981