Cello etudes difficulty table

Made this table with ChatGPT, accuracy unclear.

Etude Book Etudes (Grouped by Difficulty) Total Difficulty (5–25) Bowing (1–5) Shifting (1–5) Thumb Position (1–5) Double Stops (1–5) Special Techniques (1–5)
Lee Op. 31 1–10 5–7 1–2 1–2 1 1 1
11–20 7–9 2 2 1–2 1–2 1
21–30 9–12 2–3 2–3 1–2 2 2
31–40 12–15 3 3–4 2 2–3 2–3
Duport 1–5 8–10 2 2–3 1–2 2 1
6–10 12–14 3 3–4 2 2–3 2
11–15 14–17 3–4 4 2–3 3 2–3
16–19 17–18 4 4 3 3–4 3
20–21 19–23 4–5 4–5 4 4–5 3–4
Dotzauer 1–20 7–9 2 2 1–2 1–2 1
21–50 11–13 2–3 3 2 2–3 2
51–80 15–18 3–4 3–4 3 3–4 3
81–100 18–20 4 4 3–4 4 3–4
101–113 22–23 4–5 5 4 5 4
Franchomme Op. 7 1, 3, 6, 9 12–13 3 3 2 2–3 2
2, 4, 5, 7 17–18 4 4 3 3–4 3
8, 10 20–22 4 4–5 4 4–5 4
11, 12 25 5 5 5 5 5
Popper Op. 73 1, 3, 6, 11, 16, 19, 27 (spiccato), 36 15–17 3–4 4 3 2–3 3
2, 5, 8, 10, 15, 17, 18, 21–23, 25, 26, 30, 31, 34, 35 17–20 4 4 3–4 3–4 3–4
4, 7, 9, 12, 14, 20, 24, 27 (sautillé, presto), 28, 32, 37, 39, 40 20–25 4–5 4–5 4–5 4–5 4–5
13, 29, 33, 38 (presto) 25 5 5 5 5 5
Piatti Op. 25 1–6 20–24 4–5 4–5 4–5 4–5 4
7–12 25 5 5 5 5 5