condition mean min max ZT0-3 3.8412114075 2.308309059 5.374113756 ZT4-7 8.87373599475 7.842684559499999 9.904787429999999 ZT8-11 11.121982267 9.2438007985 13.0001637355 ZT12-15 28.50750855 22.139280245000002 34.875736855 ZT16-19 27.67416071 27.64878375 27.699537669999998 ZT20-23 28.748021995 25.51007458 31.985969409999996