condition mean min max ZT0-3 18.676575 18.209 19.14415 ZT4-7 12.1755 12.1755 12.1755 ZT8-11 8.205815000000001 8.205815000000001 8.205815000000001 ZT12-15 0 0 0 ZT16-19 14.6393 14.6393 14.6393 ZT20-23 16.78135 16.78135 16.78135