To quote said page (emphasis mine):
1 Word: 5 points of damage to stamina for 30s, stagger effect of 0.8
2 Words: 5 points of damage to stamina and magicka for 30s, stagger effect of 0.8
3 Words: 5 points of damage to stamina, magicka and health for 30s, stagger effect of 0.8
To quote said page (emphasis mine):
1 Word: 5 points of damage to stamina for 30s, stagger effect of 0.8
2 Words: 5 points of damage to stamina and magicka for 30s, stagger effect of 0.8
3 Words: 5 points of damage to stamina, magicka and health for 30s, stagger effect of 0.8