condition mean min max ZT0-3 0.5091921666666667 0.3256085 0.6708784999999999 ZT4-7 0.538599 0.538599 0.538599 ZT8-11 0.1379443 0.1379443 0.1379443 ZT12-15 0.35414864999999995 0.10529430000000001 0.603003 ZT16-19 0.658305 0.658305 0.658305 ZT20-23 0.47667550000000003 0.47667550000000003 0.47667550000000003