Table 4 Results of the mixed model, β coefficient [95% CI] representing the change of processing speed per session, results are expressed in ms.

60–64

 − 3.12 [− 3.29; − 2.95]

3.60 [3.53; 3.65]

0.09 [0.07; 0.10]

 − 7.0 [− 7.11; − 6.97]

 − 2.51 [− 2.53; − 2.48

65–69

 − 2.71 [− 2.90; − 2.52]

3.46 [3.41; 3.51]

0.04 [0.03; 0.05]

 − 5.93 [− 6.01; − 5.87]

 − 2.22 [− 2.24; − 2.20]

70–74

 − 2.81 [− 3.20; − 2.41]

3.11 [3.06; 3.16]

 − 0.05 [− 0.06; − 0.04]

 − 4.98 [− 5.06; − 4.91]

 − 2.07 [− 2.09; − 2.05]

75–79

 − 2.59 [− 2.89; − 2.29]

2.38 [2.29; 2.47]

 − 0.06 [− 0.08 ; − 0.04]

 − 4.31 [− 4.42; − 4.20]

 − 1.96 [− 1.99; − 1.92]

 ≥ 80

 − 0.68 [− 0.89; − 0.48]

2.49 [2.36; 2.63]

 − 0.10 [− 0.14 ; − 0.06]

 − 3.68 [− 3.84; − 3.51]

 − 1.77 [− 1.82; − 1.71]

p-value

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001