Curiosity & learning

So I was reading a popular novel a few years ago and I began to wonder how fast I was reading it. This led me to track the number of pages and the time I started and finished. As I was doing this, I noticed not all the chapters were the same length. I wondered if there was a pattern or structure to the length of the chapters and their placement in the book. I graphed the result and felt like there was meaning to the length of the chapter and its placement in the book. I realize this is more of an artistic interpretation or an impression. What do you think? What kind of statistical test might be used in this situation?

Chapter Page length z
1 1 12 -1.4
2 13 17 -0.6
3 30 13 -1.3
4 43 20 -0.1
5 63 23 0.4
6 86 25 0.8
7 111 26 0.9
8 137 23 0.4
9 160 16 -0.8
10 176 25 0.8
11 201 22 0.3
12 223 23 0.4
13 246 22 0.3
14 268 16 -0.8
15 284 27 1.1
16 311 19 -0.3
17 330 20 -0.1
18 350 13 -1.3
19 363 25 0.8
20 388 17 -0.6
21 405 19 -0.3
22 424 22 0.3
23 446 31 1.8
24 477 25 0.8
25 502 17 -0.6
26 519 25 0.8
27 544 10 -1.8
28 554 17 -0.6
29 571 18 -0.4
30 589 19 -0.3
31 608 30 1.6
32 638 21 0.1
33 659 32 1.9
34 691 14 -1.1
35 705 19 -0.3
36 724 29 1.4
37 753 6 -2.5
759
Average Page Length = 20.5
Standard Deviation = 5.9