condition mean min max ZT0-3 18.62535 14.246200000000002 26.62465 ZT4-7 18.3319 18.3319 18.3319 ZT8-11 21.9118 21.9118 21.9118 ZT12-15 32.0668 31.40215 32.73145 ZT16-19 20.9319 20.9319 20.9319 ZT20-23 19.1369 19.1369 19.1369