condition mean min max ZT0-3 13.25485 13.25485 13.25485 ZT4-7 10.90795 10.90795 10.90795 ZT8-11 10.5622 10.5622 10.5622 ZT12-15 12.38995 12.38995 12.38995 ZT16-19 15.63665 15.63665 15.63665 ZT20-23 13.63365 13.63365 13.63365