condition mean min max ZT0-3 19.859762 19.859762 19.859762 ZT4-7 18.871636000000002 18.871636000000002 18.871636000000002 ZT8-11 39.451228 39.451228 39.451228 ZT12-15 33.3074335 33.3074335 33.3074335 ZT16-19 43.071453500000004 43.071453500000004 43.071453500000004 ZT20-23 53.48705 53.48705 53.48705