condition mean min max ZT0-3 12.2451 12.2451 12.2451 ZT4-7 10.628350000000001 10.628350000000001 10.628350000000001 ZT8-11 8.942779999999999 8.942779999999999 8.942779999999999 ZT12-15 9.665220000000001 9.665220000000001 9.665220000000001 ZT16-19 12.78185 12.78185 12.78185 ZT20-23 13.26635 13.26635 13.26635