condition mean min max ZT0-3 7.45 7.45 7.45 ZT4-7 11.0 11.0 11.0 ZT8-11 25.95 25.95 25.95 ZT12-15 25.65 25.65 25.65 ZT16-19 11.350000000000001 11.350000000000001 11.350000000000001 ZT20-23 11.6 11.6 11.6