condition mean min max ZT0-3 42.41985 35.18025 50.32425 ZT4-7 28.349800000000002 28.349800000000002 28.349800000000002 ZT8-11 29.38325 29.38325 29.38325 ZT12-15 37.9623 37.093050000000005 38.83155 ZT16-19 40.90395 40.90395 40.90395 ZT20-23 49.3129 49.3129 49.3129