condition mean min max ZT0-3 1373.08322 1373.08322 1373.08322 ZT4-7 2223.867606 2223.867606 2223.867606 ZT8-11 1781.973672 1781.973672 1781.973672 ZT12-15 1506.5248975 1506.5248975 1506.5248975 ZT16-19 1450.385219 1450.385219 1450.385219 ZT20-23 1431.6225885 1431.6225885 1431.6225885