condition mean min max ZT0-3 16.979950000000002 16.979950000000002 16.979950000000002 ZT4-7 11.93365 11.93365 11.93365 ZT8-11 8.653915 8.653915 8.653915 ZT12-15 10.781755 10.781755 10.781755 ZT16-19 23.046999999999997 23.046999999999997 23.046999999999997 ZT20-23 17.247 17.247 17.247