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Table 4 Average marginal effects of noise exposure (Lnight)

From: Road traffic noise and cognitive function in older adults: a cross-sectional investigation of The Irish Longitudinal Study on Ageing

   dy/dx (95% C.I.) p-value dy/dx (95% C.I.) p-value
   MMSE errors MoCA errors
Noise 35.7–45.8 dB(A) [ref.]   [ref.]  
  45.9–48.9 dB(A) 0.012 (− 0.109, 0.133) 0.847 − 0.151 (− 0.290, − 0.013) 0.034
  49.0–51.2 dB(A) 0.198 (0.066, 0.329) 0.003 −0.011 (− 0.153, 0.130) 0.875
  51.3–53.7 dB(A) −0.030 (− 0.150, 0.091) 0.628 − 0.123 (− 0.261, 0.014) 0.078
  53.8–69.3 dB(A) 0.108 (− 0.030, 0.247) 0.125 − 0.011 (− 0.160, 0.138) 0.886
N   1678   1407  
   ANT score CTT-2 time
Noise 35.7–45.8 dB(A) [ref.]   [ref.]  
  45.9–48.9 dB(A) −0.053 (−0.195, 0.088) 0.457 −0.099 (− 0.233, 0.035) 0.147
  49.0–51.2 dB(A) − 0.117 (− 0.259, 0.025) 0.107 − 0.083 (− 0.229, 0.064) 0.269
  51.3–53.7 dB(A) − 0.115 (− 0.250, 0.020) 0.096 0.037 (− 0.122, 0.196) 0.648
  53.8–69.3 dB(A) − 0.209 (− 0.346, − 0.072) 0.003 0.059 (− 0.078, 0.195) 0.399
N   1667   1394  
   Immediate recall score Delayed recall score
Noise 35.7–45.8 dB(A) [ref.]   [ref.]  
  45.9–48.9 dB(A) 0.074 (−0.062, 0.211) 0.284 0.137 (0.005, 0.270) 0.043
  49.0–51.2 dB(A) 0.031 (−0.103, 0.164) 0.654 0.055 (− 0.085, 0.195) 0.442
  51.3–53.7 dB(A) 0.110 (−0.026, 0.246) 0.114 0.087 (− 0.048, 0.223) 0.207
  53.8–69.3 dB(A) 0.041 (− 0.099, 0.180) 0.570 0.054 (− 0.079, 0.187) 0.424
N   1678   1679  
   CTT-1 time CRT total time
Noise 35.7–45.8 dB(A) [ref.]   [ref.]  
  45.9–48.9 dB(A) −0.092 (−0.208, 0.025) 0.123 0.000 (−0.149, 0.149) 1.000
  49.0–51.2 dB(A) 0.078 (−0.110, 0.266) 0.413 0.035 (−0.117, 0.186) 0.653
  51.3–53.7 dB(A) −0.028 (− 0.151, 0.094) 0.649 0.083 (− 0.080, 0.245) 0.319
  53.8–69.3 dB(A) −0.030 (− 0.148, 0.088) 0.616 0.087 (− 0.082, 0.255) 0.315
N   1412   1322  
  1. Noise exposure is categorised using quintiles. Cognitive health outcome variables standardised using z-scores. Results correspond to models that adjust for socio-demographic, behavioural and health characteristics. C.I. denotes confidence interval