condition mean min max ZT0-3 1323.4 1323.4 1323.4 ZT4-7 1060.5 1060.5 1060.5 ZT8-11 1368.25 1368.25 1368.25 ZT12-15 1244.75 1244.75 1244.75 ZT16-19 963.1500000000001 963.1500000000001 963.1500000000001 ZT20-23 886.2 886.2 886.2