condition mean min max ZT0-3 12.350000000000001 12.350000000000001 12.350000000000001 ZT4-7 17.1 17.1 17.1 ZT8-11 42.1 42.1 42.1 ZT12-15 7.15 7.15 7.15 ZT16-19 44.4 44.4 44.4 ZT20-23 6.85 6.85 6.85