condition mean min max ZT0-3 197.646575 197.646575 197.646575 ZT4-7 426.79630099999997 426.79630099999997 426.79630099999997 ZT8-11 377.89719749999995 377.89719749999995 377.89719749999995 ZT12-15 276.1180995 276.1180995 276.1180995 ZT16-19 203.59763900000002 203.59763900000002 203.59763900000002 ZT20-23 205.25294 205.25294 205.25294