condition mean min max ZT0-3 379.453581 379.453581 379.453581 ZT4-7 350.4133925 350.4133925 350.4133925 ZT8-11 479.259104 479.259104 479.259104 ZT12-15 570.4445675 570.4445675 570.4445675 ZT16-19 754.62396 754.62396 754.62396 ZT20-23 858.926517 858.926517 858.926517