condition mean min max ZT0-3 23.45695 23.45695 23.45695 ZT4-7 15.498850000000001 15.498850000000001 15.498850000000001 ZT8-11 16.13045 16.13045 16.13045 ZT12-15 24.4088 24.4088 24.4088 ZT16-19 29.03115 29.03115 29.03115 ZT20-23 27.826900000000002 27.826900000000002 27.826900000000002