condition mean min max ZT0-3 8419.029433 8419.029433 8419.029433 ZT4-7 11139.250468 11139.250468 11139.250468 ZT8-11 15371.228790000001 15371.228790000001 15371.228790000001 ZT12-15 16150.883624999999 16150.883624999999 16150.883624999999 ZT16-19 12722.001289 12722.001289 12722.001289 ZT20-23 10658.227606 10658.227606 10658.227606