condition mean min max ZT0-3 14.561738333333334 8.536115 18.36165 ZT4-7 7.32466 7.32466 7.32466 ZT8-11 10.329865 10.329865 10.329865 ZT12-15 15.456175 14.9163 15.99605 ZT16-19 14.90795 14.90795 14.90795 ZT20-23 17.40075 17.40075 17.40075