. 2020 Feb 12;20:62. doi: 10.1186/s12888-020-2454-3

Table 1.

Characteristics of the ERP+ and ERP- Groups

Continuous Variables
	ERP+ Group		ERP- Group
	Mean	SD	Mean	SD		DF	T or F Statistic
Maternal Age	31.48	5.23	30.82	5.13		477	0.10
Child Age in Days	1264.85	30.01	1256.70	27.93		477	2.24^*
Household Income Category	4.0	1.07	3.63	1.10		446	2.53^*
Maternal Education Category	3.19	0.89	3.01	0.92		470	1.48
Maternal Antenatal Anxiety	31.79	9.13	35.47	10.01		457	2.81^**
Maternal Antenatal Depression	6.80	3.74	7.91	4.39		465	1.98^*
Maternal Postnatal Anxiety	6.30	5.39	6.58	4.68		348	−0.77
Maternal Postnatal Depression	33.34	9.89	34.41	9.81		344	−0.42
% Correct Pre-Switch	79.31	27.81	76.30	20.52		102	0.56
% Correct Post-Switch	79.25	28.69	73.51	18.34		102	1.05
Correct Reaction Time Pre Switch	1786.49	722.35	2109.21	942.29		102	1.92^†
Correct Reaction Time Post Switch	1957.15	510.15	2068.13	628.06		102	0.96,
Categorical Variables
	ERP+ Group			ERP-Group
	Females (%)	Males (%)		Females (%)	Males (%)		DF	χ²
Gender	29(41%)	42(59%)		191 (47%)	217(53%)		1	.87
	ERP+ Group			ERP-Group			DF	χ²
Ethnicity	Chinese (%)	Malay (%)	Indian (%)	Chinese (%)	Malay (%)	Indian (%)
	40(56%)	19(29%)	11(15%)	226(57%)	115(27%)	60(16%)	2	.08

Ethnicity data was not available for 1 ERP+ and 7 ERP- dyads. Ethnicity descriptives and statistics do not include these missing cases

^**p < .01, ^*p < .05, ^†p < .10