condition mean min max ZT0-3 308.852907 308.852907 308.852907 ZT4-7 436.7959555 436.7959555 436.7959555 ZT8-11 540.277378 540.277378 540.277378 ZT12-15 423.5865615 423.5865615 423.5865615 ZT16-19 316.0689955 316.0689955 316.0689955 ZT20-23 288.22923849999995 288.22923849999995 288.22923849999995