a negative trendp = .005
marginally significantp = .005
From 1979/1991 to 2009, a negative trend was present in expected CIDs over time, which was significant or marginally significant for model A (−0.19 ± 0.06 days/year, p = .005), model B (−0.14 ± 0.07 days/year, p = .07), and CID observations (−0.23 ± 0.13 days/year, p = .11).