condition mean min max ZT0-3 50.8 50.8 50.8 ZT4-7 14.0 14.0 14.0 ZT8-11 31.200000000000003 31.200000000000003 31.200000000000003 ZT12-15 10.1 10.1 10.1 ZT16-19 19.150000000000002 19.150000000000002 19.150000000000002 ZT20-23 36.7 36.7 36.7