condition mean min max ZT0-3 2.9326262584999996 2.7844045379999995 3.0808479789999996 ZT4-7 4.159089728 3.786836078 4.531343378 ZT8-11 5.10656900775 4.189744485 6.0233935305 ZT12-15 6.4253840285 6.168080285499999 6.6826877714999995 ZT16-19 4.42580094275 4.1555692755 4.69603261 ZT20-23 4.590466699749999 4.455229928 4.7257034715