condition mean min max ZT0-3 4.2729525 4.05307 4.4928349999999995 ZT4-7 3.12847 3.12847 3.12847 ZT8-11 3.0385400000000002 3.0385400000000002 3.0385400000000002 ZT12-15 0 0 0 ZT16-19 3.973765 3.973765 3.973765 ZT20-23 5.417630000000001 5.417630000000001 5.417630000000001