condition mean min max ZT0-3 76.30664999999999 76.30664999999999 76.30664999999999 ZT4-7 60.5419 60.5419 60.5419 ZT8-11 58.98195 58.98195 58.98195 ZT12-15 50.837950000000006 50.837950000000006 50.837950000000006 ZT16-19 79.36125000000001 79.36125000000001 79.36125000000001 ZT20-23 71.0481 71.0481 71.0481