condition mean min max ZT0-3 1.824285 1.65848 1.99009 ZT4-7 5.56339 5.56339 5.56339 ZT8-11 6.619009999999999 6.619009999999999 6.619009999999999 ZT12-15 0 0 0 ZT16-19 6.49317 6.49317 6.49317 ZT20-23 3.665625 3.665625 3.665625