condition mean min max ZT0-3 4.135145 3.113555 5.76576 ZT4-7 4.82159 4.82159 4.82159 ZT8-11 6.584325 6.584325 6.584325 ZT12-15 11.65755 4.1126000000000005 19.2025 ZT16-19 9.383485 9.383485 9.383485 ZT20-23 6.267335 6.267335 6.267335