condition mean min max ZT0-3 16.675775 11.798100000000002 21.553449999999998 ZT4-7 20.05525 20.05525 20.05525 ZT8-11 16.4574 16.4574 16.4574 ZT12-15 0 0 0 ZT16-19 16.08126 16.08126 16.08126 ZT20-23 17.96455 17.96455 17.96455