Table 3.

Estimation of the indirect cost function of patient attendance

Explanatory variable	Estimated Value	Probability	Estimated Value	Probability	Estimated Value	Probability	Estimated Value	Probability
Patient' age	0.0223	0.0300	-0.0345	0.189			0.00380	0.934
Patient' age 2	1.00 × 10-4	0.669	4.03 × 10-3	0.0170	1.80 × 10-3	0.000	-5.00 × 10-4	0.905
Patient' age 3			-6.600 × 10-5	0.0190	-3.10 × 10-5	4.00 × 10-2	0.0011	0.529
Patient' age 4							-2.16 × 10-6	0.311
Constant term	8.65	0.000	8.73	0.000	8.67	0.000	8.69	0.000
No. of samples	99		99		99		99
F statistic	48.8		36.5		53.3		27.2
Probability	= < 0.000		= < 0.000		= < 0.000		= < 0.000

Note that Table 3 is cited in the additional file 1(Technical Annex).

99 samples were selected based on data reliability of age and employment status.

One sample was omitted because parental age and employment status were unclear.