condition mean min max ZT0-3 61.5 61.5 61.5 ZT4-7 115.3 115.3 115.3 ZT8-11 162.55 162.55 162.55 ZT12-15 109.45 109.45 109.45 ZT16-19 97.55000000000001 97.55000000000001 97.55000000000001 ZT20-23 113.0 113.0 113.0