condition mean min max ZT0-3 24.45 24.45 24.45 ZT4-7 42.4 42.4 42.4 ZT8-11 32.4 32.4 32.4 ZT12-15 23.85 23.85 23.85 ZT16-19 11.350000000000001 11.350000000000001 11.350000000000001 ZT20-23 53.25 53.25 53.25