condition mean min max ZT0-3 6.830115 6.830115 6.830115 ZT4-7 5.076255 5.076255 5.076255 ZT8-11 6.344315 6.344315 6.344315 ZT12-15 8.556574999999999 8.556574999999999 8.556574999999999 ZT16-19 10.287695 10.287695 10.287695 ZT20-23 8.48811 8.48811 8.48811