Superstorm Sandy caused nearly a 30 percent increase in subway delays during the first three months of this year.

A study by the Straphangers Campaign also found that subway delays were up by 10 percent in 2012 — 10 months before the storm.

The study was based on MTA electronic alerts of so-called controllable delays — problems related to signals, switches and track.

The study found the F train had the most delays, accounting for 8 percent of the 2,669 alerts issued.

The L train had the largest increase in delays — 60 percent.

The line with the fewest delays was the G.

The MTA says the study doesn’t paint a full picture of the service issue but does serve to highlight the agency’s efforts to keep customers informed.

(AP)