condition mean min max ZT0-3 434.835037 434.835037 434.835037 ZT4-7 487.057825 487.057825 487.057825 ZT8-11 599.6367185 599.6367185 599.6367185 ZT12-15 624.33341 624.33341 624.33341 ZT16-19 546.060121 546.060121 546.060121 ZT20-23 592.293807 592.293807 592.293807