condition mean min max ZT0-3 6.9173849999999995 6.82726 7.00751 ZT4-7 6.999625 6.999625 6.999625 ZT8-11 6.49517 6.49517 6.49517 ZT12-15 0 0 0 ZT16-19 9.49641 9.49641 9.49641 ZT20-23 10.298815000000001 10.298815000000001 10.298815000000001