condition mean min max ZT0-3 253.2 253.2 253.2 ZT4-7 426.3 426.3 426.3 ZT8-11 323.20000000000005 323.20000000000005 323.20000000000005 ZT12-15 431.4 431.4 431.4 ZT16-19 407.75 407.75 407.75 ZT20-23 276.3 276.3 276.3