condition mean min max ZT0-3 39.876422274999996 37.87235226 41.88049229 ZT4-7 44.26164913833333 39.81076028 48.71253799666667 ZT8-11 39.38551074666667 39.15492161 39.616099883333334 ZT12-15 40.05107449333333 39.77836818 40.32378080666667 ZT16-19 41.201391395 39.4053287 42.99745409 ZT20-23 38.35031227 36.07270516 40.62791938