condition mean min max ZT0-3 20.672327 20.672327 20.672327 ZT4-7 55.170182499999996 55.170182499999996 55.170182499999996 ZT8-11 53.354079999999996 53.354079999999996 53.354079999999996 ZT12-15 39.2686675 39.2686675 39.2686675 ZT16-19 22.4496275 22.4496275 22.4496275 ZT20-23 21.371417 21.371417 21.371417