condition mean min max ZT0-3 14.2664 14.2664 14.2664 ZT4-7 10.9059 10.9059 10.9059 ZT8-11 14.0517 14.0517 14.0517 ZT12-15 15.2711 15.2711 15.2711 ZT16-19 22.1297 22.1297 22.1297 ZT20-23 11.96434 11.96434 11.96434