condition mean min max ZT0-3 0.5101935 0.5101935 0.5101935 ZT4-7 0.664397 0.664397 0.664397 ZT8-11 0.38371350000000004 0.38371350000000004 0.38371350000000004 ZT12-15 0.332182 0.332182 0.332182 ZT16-19 0.48612900000000003 0.48612900000000003 0.48612900000000003 ZT20-23 0.47190200000000004 0.47190200000000004 0.47190200000000004