condition mean min max ZT0-3 14.253333333333332 11.171 17.226 ZT4-7 16.0612 16.0612 16.0612 ZT8-11 12.557400000000001 12.557400000000001 12.557400000000001 ZT12-15 13.685975 13.55945 13.8125 ZT16-19 16.0467 16.0467 16.0467 ZT20-23 20.6087 20.6087 20.6087