condition mean min max ZT0-3 119.27552478 98.14696115999999 140.4040884 ZT4-7 16.5947892565 12.178308492 21.011270021 ZT8-11 26.6671908075 17.188492775 36.14588884 ZT12-15 37.5817205375 36.190659905 38.97278117 ZT16-19 45.6803452925 41.30301702 50.057673565 ZT20-23 60.4485012625 60.368774815 60.528227709999996