. 2017 Mar 9;16:47. doi: 10.1186/s12939-017-0544-8

Table 5.

Negative binomial regression results on the use of infusion during outpatient visits in the past 2 weeks

	Whether or not children used infusion during outpatient visits (marginal effect reported)
	(1) Full sample				(2) Age 0-5				(3) Age 6-11				(4) Age 12-18
	dy/dx	S.E.	95% CI		dy/dx	S.E.	95% CI		dy/dx	S.E.	95% CI		dy/dx	S.E.	95% CI
Parents had outpatient visit	0.5701^a	0.0518	0.4686	0.6716	0.6624^a	0.0412	0.5817	0.7431	0.5447^b	0.1527	0.2454	0.8441	0.3005	0.1874	−0.0668	0.6679
Per capita household expense
Poor	0.1114	0.0713	−0.0284	0.2512	0.2073^b	0.1036	0.0042	0.4104	0.1329	0.1337	−0.1291	0.3948	−0.172	0.1500	−0.4660	0.1221
Average	0.0243	0.0734	−0.1194	0.1681	0.1086	0.1137	−0.1141	0.3314	−0.1129	0.1279	−0.3635	0.1377	−0.0308	0.1764	−0.3765	0.3150
Rich	0.1145	0.0769	−0.0362	0.2652	0.1482	0.1089	−0.0651	0.3616	0.0696	0.1790	−0.2812	0.4204	0.1024	0.1816	−0.2535	0.4583
Richest	0.2171^a	0.0768	0.0665	0.3677	0.2940^a	0.1061	0.0860	0.5020	0.4491^a	0.1494	0.1564	0.7418	−0.2679^a	0.1343	−0.5312	−0.0046
Children had insurance	0.0162	0.0798	−0.1402	0.1725	0.0134	0.0898	−0.1627	0.1895	0.2024	0.1986	−0.1869	0.5916
Children’s days of illness	0.0170^a	0.0059	0.0054	0.0286	0.0270^a	0.0090	0.0093	0.0447	0.0129	0.0119	−0.0104	0.0363	−0.0039	0.0126	−0.0287	0.0208
Children’s height (ln)	−0.3658^b	0.1470	−0.6538	−0.0777	−0.3580^b	0.1696	−0.6903	−0.0256	−0.2018	0.4052	−0.9959	0.5924	−3.1048^a	1.0277	−5.1190	−1.0905
Children’s weight (ln)	0.1626^b	0.0664	0.0324	0.2928	0.1033	0.0731	−0.0400	0.2465	0.2773	0.2061	−0.1267	0.6813	0.6444	0.4297	−0.1978	1.4866
Prenatal days of illness	−0.0136^b	0.0057	−0.0247	−0.0024	−0.0252^a	0.0083	−0.0415	−0.0089	−0.0112	0.0126	−0.0358	0.0134	−0.0036	0.0119	−0.0268	0.0197
Parental age	0.0030^a	0.0017	−0.0003	0.0063	0.0047^b	0.0022	0.0004	0.0089	−0.0059	0.0044	−0.0144	0.0027	0.0001	0.0071	−0.0139	0.0141
Children’s age
3–5	−0.0299	0.0623	−0.1520	0.0923	−0.0079	0.0695	−0.1441	0.1284
6–8	0.0261	0.0896	−0.1496	0.2018
9–11	−0.0916	0.1032	−0.2939	0.1108					−0.1808^a	0.0965	−0.3698	0.0083
12–14	−0.0229	0.1298	−0.2774	0.2315
15–18	0.0245	0.1472	−0.2639	0.3130									0.2925^b	0.1142	0.0687	0.5162
Gender was male	0.0431	0.0402	−0.0356	0.1219	0.0601	0.0560	−0.0496	0.1698	−0.0191	0.0822	−0.1803	0.1421	0.0962	0.1042	−0.1229	0.2857
Ethnicity was Han	−0.1443	0.2482	−0.6308	0.3422	−0.0702	0.2942	−0.6468	0.5064
Urban	0.0476	0.0455	−0.0417	0.1368	0.0418	0.0623	−0.0803	0.1639	0.0186	0.0988	−0.1751	0.2123	0.0962	0.1209	−0.1409	0.3332
Region
Guanzhong	−0.0127	0.0470	−0.1049	0.0795	−0.0106	0.0650	−0.1380	0.1167	−0.0644	0.0999	−0.2601	0.1313	−0.1179	0.1093	−0.3321	0.0963
Shanbei	−0.0184	0.0603	−0.1366	0.0999	0.0066	0.0808	−0.1517	0.1650	−0.2344^b	0.0960	−0.4225	−0.0463	0.0728	0.1741	−0.2685	0.4141
Family size	0.0267	0.0179	−0.0084	0.0618	0.0394	0.0256	−0.0108	0.0897	0.0853^b	0.0357	0.0152	0.1553	−0.1122^b	0.0497	−0.2096	−0.0148
No. of obs.	672				391				164				115

Note: ^aStatistically significant at the 1% level, ^bstatistically significant at the 5% level, ^astatistically significant at the 10% level; S.E. robust standard errors; marginal effects instead of the original coefficients are reported to show the marginal change of the dependent variable given a one unit change in an explanatory variable. The reference groups were: “the poorest” for “per capita household expense”; “no” for “children had insurance”; “0–2” for “children’s age”; “female” for “gender was male”; “others” for “ethnicity was Han”; “rural” for “urban”; “Shannan” for “region”