condition mean min max ZT0-3 11.1466 11.1466 11.1466 ZT4-7 6.30991 6.30991 6.30991 ZT8-11 9.748545 9.748545 9.748545 ZT12-15 11.952950000000001 11.952950000000001 11.952950000000001 ZT16-19 20.1003 20.1003 20.1003 ZT20-23 16.829050000000002 16.829050000000002 16.829050000000002