condition mean min max ZT0-3 0.6095221666666667 0.422588 0.931832 ZT4-7 0.3054155 0.3054155 0.3054155 ZT8-11 0.274358 0.274358 0.274358 ZT12-15 0.35057574999999996 0.2541425 0.447009 ZT16-19 0.511003 0.511003 0.511003 ZT20-23 0.6147670000000001 0.6147670000000001 0.6147670000000001