How do paragraph-initial gallows effect a paragraph?

[Skoove]

Has anyone done a statistical analysis of whether which of the four gallows (or no gallow at all) is used as the first glyph in a paragraph effects the paragraph? I know that the gallows have varied paragraph initial frequency but it isn't immediately obvious to me what their effect on their paragraphs. Especially since different gallows are used as paragraph-initial on a single page.

I have always wondered if it is simply random, topic relevant, perhaps even marking which key to use for the following paragraph? Probably many more theories that one could (and likely have) come up with.