condition mean min max ZT0-3 9.85 9.85 9.85 ZT4-7 11.2 11.2 11.2 ZT8-11 8.2 8.2 8.2 ZT12-15 8.95 8.95 8.95 ZT16-19 6.6 6.6 6.6 ZT20-23 11.100000000000001 11.100000000000001 11.100000000000001