condition mean min max ZT0-3 65.6 65.6 65.6 ZT4-7 30.2 30.2 30.2 ZT8-11 37.15 37.15 37.15 ZT12-15 48.150000000000006 48.150000000000006 48.150000000000006 ZT16-19 57.4 57.4 57.4 ZT20-23 83.05 83.05 83.05