condition mean min max ZT0-3 3.16724294725 1.6859497855 4.648536109 ZT4-7 4.84820040925 2.7957761275000004 6.900624691000001 ZT8-11 17.2611506475 12.939624465 21.58267683 ZT12-15 42.838886125 37.11758037 48.560191880000005 ZT16-19 39.83431804 39.389457235 40.279178845000004 ZT20-23 44.15260336750001 42.024707500000005 46.280499235