Validity of a two-item physical activity questionnaire for assessing attainment of physical activity guidelines in youth

Table 4 Agreement, sensitivity and specificity between self-reported physical activity and accelerometer data for compliance with recommendations

	≥5 valid accelerometer days (n = 235)					Seven valid accelerometer days (n = 77)
	Agreement	Sensitivity	PPV^c	Specificity	NPV^d	Agreement	Sensitivity	PPV^c	Specificity	NPV^d
	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)
Average method^a
Total	78.7	56.5	30.6	68.8	86.7	77.9	7.7	25.0	95.3	83.6
Sex
Male	72.2	66.7	45.5	64.2	81.1	75.0	14.3	50.0	95.2	76.9
Female	83.3	37.5	14.6	71.3	89.7	79.6	NC	NC	95.3	87.2
School level
Primary	67.8	53.6	40.5	62.7	74.0	71.4	NC	NC	100	75.0
Post Primary	85.1	61.1	22.9	71.5	93.0	81.6	16.7	25.0	93.0	88.9
All days method^b
Total	90.2	60.9	16.5	66.5	94.0	90.2	NC	NC	93.4	98.6
Sex
Male	88.7	66.7	22.7	58.5	90.6	92.9	NC	NC	92.9	100
Female	91.3	50.0	9.8	71.5	95.9	89.8	NC	NC	95.8	97.9
School level
Primary	93.1	61.5	21.6	60.8	90.0	96.4	NC	NC	100	100
Post Primary	88.5	60.0	12.5	69.6	96.0	87.8	NC	NC	91.7	97.8

NC not computable as no participants met the PAGL using all 7 days method
^aAverage method (AM): proportion achieving an average of 60 mins or more of MVPA across all valid days
^bAll days method (ADM): proportion achieving ≥ 60 mins MVPA on (i) ≥5 days (ii) 7 days
^cPPV: positive predictive value
^dNPV: negative predictive value

ISSN: 1471-2458