I am still experimenting with the stats. Currently, we will follow this trend. There are a few mistakes in initial chapters which I will fix slowly.
A simple classification of stats for the novel.
<10: civilian kids, elderly folks, etc.
10: Average civilian stats
15: Peak civilian stats
15-30: Genin Stats
30-50: Chunnin stats (>30 in two stats for low-tier, in 4 mid-tier, in 6 high-tier, 8 peak tier)
50-100: Jounin Stats (>50 in 1 for special jounin and low-tier jounin, 2-3 for mid-tier jounin, 3-5 for high-tier, 5 and above for peak tier)
>100: Kage Level (1 stat for low-tier, 2 for mid-tier, 3 for top-tier, 3+ rest of the stats above 70 peak tier)
Note: - Some special abilities can enhance a person's power above their level and also, it's not absolutely necessary that someone with high stats will always win.