condition mean min max ZT0-3 16.5488 16.5488 16.5488 ZT4-7 13.7088 13.7088 13.7088 ZT8-11 14.9246 14.9246 14.9246 ZT12-15 16.983249999999998 16.983249999999998 16.983249999999998 ZT16-19 21.01485 21.01485 21.01485 ZT20-23 19.6197 19.6197 19.6197