condition mean min max ZT0-3 1.26329 1.26329 1.26329 ZT4-7 1.288845 1.288845 1.288845 ZT8-11 1.2127750000000002 1.2127750000000002 1.2127750000000002 ZT12-15 1.18787 1.18787 1.18787 ZT16-19 1.21136 1.21136 1.21136 ZT20-23 1.50008 1.50008 1.50008