The Accuracy of My IWC Mark XVII

[Davidloverolex]

Hi members of the Rolex Forum,
I just finished collecting 30 days' worth of data (out of curiosity) regarding the accuracy of my IWC Mark XVII (ref. 3265-04). On Feb 4, I set my watch to the official atomic clock and every day thereafter, I recorded how many seconds it was faster than that time source. I wore the watch on my wrist for the majority of the day and it always sat crown down on the nightstand. I have attached an excel picture of the data. The mean rate was +0.903 seconds/day and the standard deviation was 0.405 seconds/day. What do you think of its accuracy? Has any one of you done analysis like this for your watches? If so, please let me know of your results as I am eager to compare. Any comments regarding charts formatting and/or statistics work?
TL;DR: My IWC gains on average 0.903 seconds/day.