condition mean min max ZT0-3 68.62705 68.62705 68.62705 ZT4-7 53.40705 53.40705 53.40705 ZT8-11 33.0317 33.0317 33.0317 ZT12-15 54.182550000000006 54.182550000000006 54.182550000000006 ZT16-19 56.834999999999994 56.834999999999994 56.834999999999994 ZT20-23 55.7424 55.7424 55.7424