Impacts of computer-assisted diagnostic assessment on sustainability of L2 learners’ collaborative writing improvement and their engagement modes

Table 7 Post-hoc multiple comparison: pretest, the immediate and delayed posttest scores

(I)group	(J)group	Mean difference (I–J)	Std. error	Sig.	95% confidence interval
(I)group	(J)group	Mean difference (I–J)	Std. error	Sig.	Lower bound	Upper bound
Pretest	Immediate posttest	13.220*	.380	.000*	12.980	14.980
	Delayed posttest	13.063*	.381	.000*	12.091	15.012
Immediate posttest	Pretest	13.220*	.380	.000*	12.980	14.980
	Delayed posttest	.170	.430	.949	− .670	.939