condition mean min max ZT0-3 65.9 65.9 65.9 ZT4-7 11.7 11.7 11.7 ZT8-11 61.1 61.1 61.1 ZT12-15 48.150000000000006 48.150000000000006 48.150000000000006 ZT16-19 57.65 57.65 57.65 ZT20-23 50.8 50.8 50.8