condition mean min max ZT0-3 14.600000000000001 14.600000000000001 14.600000000000001 ZT4-7 10.8 10.8 10.8 ZT8-11 10.549999999999999 10.549999999999999 10.549999999999999 ZT12-15 21.349999999999998 21.349999999999998 21.349999999999998 ZT16-19 8.45 8.45 8.45 ZT20-23 9.75 9.75 9.75