Board Thread:Questions and Answers/@comment-188.79.230.66-20130925193902/@comment-115.66.101.83-20141128113452

Dexterity is one of them, I think. From what I can tell, it affects both the player's base speed as well as the speed/efficiency that one uses a tool, weapon or skill. And it can be increased, as well, judging by what is said in the first excerpt.

Excerpt from Volume 1, Chapter 9.

As we started screaming at the same time, we turned a full one hundred eighty degrees and ran as fast as we could. We knew that in theory, the boss couldn’t come out of its room, but we just couldn’t stay there. Entrusting our bodies to the dexterity stats that we’d trained up until now, we ran like a gust of wind down the hallway.

Excerpt from Volume 1, Chapter 6.

Flash, a silver streak seemed to cut the air in front of me, and by the time I registered it, Asuna’s knife was already held just in front of my nose. It’s a basic rapier skill, «Linear». Well, I say basic, but because of Asuna’s overwhelming dexterity, the speed was amazing. To tell the truth, I couldn’t even see the weapon’s trajectory.

Excerpt from Volume 1, Chapter 5.

Well, however low my skill was, my hand was backed up by my high dexterity and threw the pick in a blur of motion. The pick glinted once and then was sucked into the trees. As soon as I attacked, the cursor, which showed the direction the Ragout Rabbit was in, turned red and the HP bar appeared beneath it.

Of course, considering what Gsimenas quoted above, this could have been retconned during Volume 8. Or it could have been a stat that could only appeared after one's level was high enough, as all the excerpts above take place when the clearing guilds were at Floor 74. So Kirito and Asuna would be at level 90+.