Table 6.

Analysis of learning effect decay over time and predictive model.

Time point	k	N	g	95% CI	Retention rate	Decay rate
Post-intervention immediate	44	3,789	0.72***	[0.58, 0.86]	100%	–
2 weeks later	18	1,567	0.63***	[0.46, 0.80]	87%	−0.045/week
After 4 weeks	15	1,234	0.57***	[0.38, 0.76]	79%	−0.038/week
After 8 weeks	11	897	0.51**	[0.29, 0.73]	71%	−0.026 per week
After 12 weeks	6	456	0.48*	[0.21, 0.75]	67%	−0.021/week

Exponential decay model: g(t) = 0.72 × e^(−0.031t), R² = 0.94. t = number of weeks; **p < 0.05, ***p < 0.01, *p < 0.001.