condition mean min max ZT0-3 15.605623609999999 14.72504286 16.48620436 ZT4-7 9.5260663105 9.3601535675 9.6919790535 ZT8-11 12.572588127500001 9.457968865 15.687207390000001 ZT12-15 22.2835758775 21.030982 23.536169755 ZT16-19 29.789807565 29.46771983 30.1118953 ZT20-23 30.2335753025 29.702936025 30.76421458