condition mean min max ZT0-3 37.5 37.5 37.5 ZT4-7 8.3 8.3 8.3 ZT8-11 31.0 31.0 31.0 ZT12-15 20.6 20.6 20.6 ZT16-19 41.65 41.65 41.65 ZT20-23 53.150000000000006 53.150000000000006 53.150000000000006