Table 2.

Table 2 Comparison of Data Entry Duration, Number of Typing Errors and Missing Data Errors Between the Handheld and the Laptop Data Entry Modes

Variable	Handheld	Laptop	p Value ∗
Data entry duration (min)
mean (SD)	3.3 (1.9)	2.0 (1.2)	<0.001
Number of questionnaires recorded with typing errors (one or more)
n (proportion)	124 (38.8%)	68 (21.3%)	<0.001
overall n of typing errors per 1000 entries	8.4	5.8
Number of subsequent errors following an initial typing error
n per 1000 entries	21.7	27.1	<0.01
Number of questionnaires recorded with missing data errors (one or more)
n (proportion)	208 (65.0%)	46 (14.4%)	<0.001
overall n of missing errors per 1000 entries	22.8	2.9
Number of subsequent missing fields following an initial missing data error
n per 1000 entries	35.1	20.5	<0.001

^∗ Adjusted difference between handheld and laptop, using GLMM.

SD = standard deviation.