Table 4. Single factor analysis of physical growth of PI at 12 months.

Stem	High risk factors	N	Total score, $\overline{x}\pm s$	F	P value
Weight	Birth weight (g)			18.285	0.000
	1,000–1,499	86	9,393.37±739.69
	1,500–1,999	114	10,239.32±1,056.64
	2,000–2,500	15	11,334.93±697.54
	Gender			14.445	0.000
	Male	97	10,273.61±993.14
	Female	118	9,733.86±1,070.20
	Feeding mode			4.839	0.009
	Non breast feeding	49	9,730.38±1,472.05
	Breast-feeding	103	10,208.46±1,017.60
	Mixed feeding	63	9,977.38±1,068.24
	Average monthly household income (CNY)			9.917	0.000
	<3,000	95	9,629.60±963.61
	3,000–5,000	86	10,220.93±923.66
	>5,000	34	10,333.06±1,387.25
Length	Group			7.071	0.008
	FIcare group	115	73.43±3.09
	Control group	100	72.30±3.10
	Gestational age (weeks)			22.567	0.000
	28–29	85	70.33±2.22
	30–31	101	74.05±2.16
	32–33	29	76.45±2.47
	Birth length (cm)			18.494	0.000
	35–38	67	69.60±2.04
	39–41	117	73.70±1.83
	42–44	31	77.03±1.96
	Gender			11.373	0.001
	Male	97	73.68±2.73
	Female	118	72.26±3.32
	Average monthly household income (CNY)			9.667	0.000
	<3,000	95	71.88±2.99
	3,000–5,000	86	73.71±2.76
	>5,000	34	73.70±3.69
Head circumference	Group			10.957	0.013
	FIcare group	115	44.78±1.28
	Control group	100	44.33±1.36
	Gestational age (weeks)			21.505	0.000
	28–29	85	43.43±0.89
	30–31	101	45.15±0.92
	32–33	29	45.90±1.11
	Birth head circumference (cm)			18.846	0.000
	25–28	79	43.37±1.00
	29–31	124	45.15±0.86
	32–34	12	46.50±1.00
	Gender			10.972	0.001
	Male	97	44.90±1.25
	Female	118	44.31±1.34
	Average monthly household income (CNY)			9.829	0.000
	<3,000	95	44.15±1.25
	3,000–5,000	86	44.93±1.20
	>5,000	34	44.88±1.55

PI, premature infant; FIcare, family integrated care.