My stats before:
Body: 25 Awareness: 25 Charisma: 15 Karma: 20 Smarts: 15
Persuasion: 51 Investigation: 48 Thievery: 60 Fitness: 62
My stats after choosing to improve thievery:
Body: 25 Awareness: 25 Charisma: 15 Karma: 20 Smarts: 15
Persuasion: 51 Investigation: 48 Thievery: 99 Fitness: 62