condition mean min max ZT0-3 609.0840000000001 609.0840000000001 609.0840000000001 ZT4-7 572.028 572.028 572.028 ZT8-11 470.467 470.467 470.467 ZT12-15 500.07349999999997 500.07349999999997 500.07349999999997 ZT16-19 581.2115 581.2115 581.2115 ZT20-23 639.1975 639.1975 639.1975