condition mean min max ZT0-3 11.323365 11.323365 11.323365 ZT4-7 10.615338 10.615338 10.615338 ZT8-11 10.8366135 10.8366135 10.8366135 ZT12-15 10.4290805 10.4290805 10.4290805 ZT16-19 11.6597565 11.6597565 11.6597565 ZT20-23 11.165272000000002 11.165272000000002 11.165272000000002