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Table 3 Independent and interaction effects of previous falls and fear of falling on developing activity limitations by sex

From: Fear of falling is as important as multiple previous falls in terms of limiting daily activities: a longitudinal study

Variables Stratified Analysis
IRR [95%CI]
Analysis with Interaction Term
IRR [95%CI]
Male Female  
Mobility
 One Fall 1.24 [0.92,1.67] 0.88 [0.62,1.25] 1.09 [0.87,1.37]
 Multiple Falls 1.67 [1.14,2.45]** 1.83 [1.23,2.74]** 1.72 [1.30,2.28]***
 Fear of Falling 2.07 [1.58,2.71]*** 1.59 [1.10,2.30]* 1.53 [1.07,2.18]*
 Fear of Falling*Sex    1.33 [0.86,2.04]
Self-care activities
 One Fall 0.95 [0.79,1.13] 0.96 [0.80,1.16] 0.96 [0.84,1.09]
 Multiple Falls 1.49 [1.22,1.82]*** 1.27 [0.96,1.68] 1.40 [1.19,1.66]***
 Fear of Falling 1.50 [1.24,1.81]*** 1.05 [0.87,1.28] 1.01 [0.84,1.22]
 Fear of Falling*Sex    1.50 [1.16,1.94]**
Household activities
 One Fall 1.32 [0.98,1.77] 1.00 [0.74,1.36] 1.15 [0.93,1.42]
 Multiple Falls 1.29 [0.84,1.98] 1.56 [1.05,2.32]* 1.39 [1.03,1.86]*
 Fear of Falling 2.10 [1.60,2.76]*** 0.98 [0.67,1.44] 0.90 [0.62,1.32]
 Fear of Falling*Sex    2.36 [1.51,3.71]***
  1. * IRR incidence rate ratio; * p < .05, ** p < .01, *** p < .001
  2. Stratified analysis: demographic covariates (age, education, race/ethnicity, living arrangement), health-related covariates (BMI, number of chronic illnesses, hospitalizations, depression, cognitive function), and behavioral covariates (smoking and vigorous activities)
  3. Analysis with interaction terms: demographic covariates (age, sex education, race/ethnicity, living arrangement), health-related covariates (BMI, number of chronic illnesses, hospitalizations, depression, cognitive function), and behavioral covariates (smoking and vigorous activities)