condition mean min max ZT0-3 641.95 641.95 641.95 ZT4-7 533.1 533.1 533.1 ZT8-11 511.2 511.2 511.2 ZT12-15 452.25 452.25 452.25 ZT16-19 332.54999999999995 332.54999999999995 332.54999999999995 ZT20-23 520.5999999999999 520.5999999999999 520.5999999999999