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Table 2 Risk factors of seizure frequency in the last 2 months among patients with epilepsy in University of Gondar Referral Hospital from Zero Inflated Negative Binomial Poisson Regression model, 2017 (n = 408)

From: Frequency of seizure attack and associated factors among patients with epilepsy at University of Gondar Referral Hospital: a cross-sectional study, Gondar, North West Ethiopia, 2017

Variables Seizure frequency CIRR(95% CI) AIRR(95% CI) P-value
0 1_5 ≥ 6
Noise
 No 169 80 1 1 1 < 0.001
 Yes 73 76 9 2.89(2.08, 4.01) 1.91(1.46, 2.49)***
Light
 No 208 108 4 1 1 0.011
 Yes 34 48 6 2.33(1.59, 3.41) 1.48(1.09, 2.00)*
Humidity
 No 234 147 8 1 1 0.147
 Yes 8 9 2 2.46(1.18, 5.13) 1.62(0.84, 3.13)
Head injury
 No 238 155 8 1 1 0.009
 yes 3 12 2 3.50(1.67, 7.34) 1.71(1.14, 2.57)**
Meal on time
 No 203 188 6 1 1 0.192
 Yes 39 38 4 1.69(1.12, 2.55) 1.21(0.90, 1.62)
Sleep deprivation
 No 216 213 6 1 1 0.035
 Yes 26 43 4 2.21(1.48, 3.36) 1.41(1.02, 1.94)*
Strenuous exercise
 No 222 133 6 1 1 0.607
 Yes 20 23 4 1.80(1.09, 2.99) 1.10(0.76, 1.60)
Side effect
 No 222 142 6 1 1 0.316
 Yes 20 14 4 1.87(1.08, 3.24) 1.33(0.76, 2.35)
Variables Seizure COR(95% CI) AOR(95% CI) P-value
Zero Non-Zero
Inflation model
 Adherence
  Non adherent 95 132 1 1  
  Adherent 146 34 0.17(0.11, 0.26) 18.18(3.49, 94.63)*** 0.001
 Wealth index
  Poor 70 83 1 1  
  Middle 100 46 0.38(0.24, 0.62) 3.52(1.14, 11.02)* 0.029
  Rich 72 37 0.43(0.26, 0.72) 4.05(1.54, 10.69)** 0.005
 A Unit raise in sleeping hours 0.89(0.81, 0.98) 1.04(0.78, 1.40) 0.750
  1. Italics show significance
  2. *** P-value less than 0.001, ** P-value less than 0.01, * P-Value less than 0.05, 1-Reference Category