Anemia status of infants and young children aged six to thirty-six months in Ma'anshan City: A retrospective study

Table 1 Mean hemoglobin levels for different age groups

Age	n	Hb (g/L), mean ± SD	F	P value
6 mo	29291	119.46 ± 10.15	2004.658	< 0.001
9 mo	7105	117.14 ± 10.45
12 mo	17374	121.34 ± 10.33
24 mo	14799	126.58 ± 9.54
36 mo	5839	126.91 ± 9.18

Hb: Hemoglobin.

Table 2 Mean hemoglobin levels for different genders in each age group

Age	Gender	n	Hb (g/L), mean ± SD	t	P value
6 mo	Male	15244	119.38 ± 10.45	-1.415	0.157
	Female	14047	119.55 ± 9.81
9 mo	Male	3821	117.07 ± 10.69	-0.611	0.541
	Female	3284	117.22 ± 10.17
12 mo	Male	9065	121.61 ± 10.56	3.583	0.000
	Female	8309	121.05 ± 10.06
24 mo	Male	7704	126.69 ± 9.55	1.415	0.157
	Female	7095	126.46 ± 9.54
36 mo	Male	2562	126.81 ± 9.03	-0.774	0.439
	Female	3277	127.00 ± 9.31

Hb: Hemoglobin.

Table 3 Detection rate of anemia in infants at different ages, n (%)

Age	Anemia		χ2	P value
	Prevalence rate	Absence of prevalence
6 mo	3862 (13.2)	25429 (86.8)	2366.51	< 0.001
9 mo	1389 (19.5)	5716 (80.5)
12 mo	1690 (9.7)	15684 (90.3)
24 mo	372 (2.5)	14427 (97.5)
36 mo	129 (2.2)	5710 (97.8)

Table 4 The difference of anemia rate in children of different ages and different genders and different regions, n (%)

Age	Category	n	Prevalence rate	Absence of prevalence	χ2	P value
6 mo	Male	15244	2152 (14.1)	13092 (85.9)	24.126	< 0.001
	Female	14047	1710 (12.2)	12337 (87.8)
	Urban	10453	1088 (10.4)	9365 (89.6)	109.457	< 0.001
	Rural	18838	2774 (14.7)	16064 (85.3)
9 mo	Male	3821	774 (20.3)	3047 (79.7)	2.626	0.105
	Female	3284	615 (18.7)	2762 (85.8)
	Urban	3219	457 (14.2)	2762 (92.6)	107.215	< 0.001
	Rural	3886	932 (24.0)	2954 (76.0)
12 mo	Male	9065	879 (9.7)	8186 (90.3)	0.020	0.887
	Female	8309	811 (9.8)	7498 (90.2)
	Urban	7106	450 (6.3)	6656 (93.7)	157.778	< 0.001
	Rural	10268	1240 (12.1)	9028 (87.9)
24 mo	Male	7704	174 (2.3)	7530 (97.7)	4.268	0.039
	Female	7095	198 (2.8)	6897 (97.2)
	Urban	4968	120 (2.4)	4848 (97.6)	0.294	0.587
	Rural	9831	252 (2.6)	9579 (97.4)
36 mo	Male	2562	57 (2.2)	2505 (97.8)	0.005	0.943
	Female	3277	72 (2.2)	3205 (97.8)
	Urban	1864	43 (2.3)	1821 (97.7)	0.121	0.728
	Rural	3975	86 (2.2)	3889 (97.8)

Table 5 Detection rate of anemia with different nutritional status at all ages (emaciation/ overweight/obese/normal), n (%)

Age	Figure	Prevalence rate	Absence of prevalence	χ2	P value
6 mo	Emaciation	33 (13.8)	207 (86.3)	6.619	0.085
	Normal	3011 (12.9)	20259 (87.1)
	Overweight	660 (14.0)	4060 (86.0)
	Obese	158 (14.9)	903 (85.1)
9 mo	Emaciation	24 (26.1)	68 (73.9)	16.882	0.001a
	Normal	1062 (18.9)	4570 (81.1)
	Overweight	231 (20.5)	894 (79.5)
	Obese	72 (28.1)	184 (71.9)a,c
12 mo	Emaciation	28 (12.6)	195 (87.4)	15.383	0.002a
	Normal	1317 (9.4)	12626 (90.6)
	Overweight	274 (10.1)	2436 (89.9)
	Obese	71 (14.3)	427 (85.7)
24 mo	Emaciation	6 (2.9)	203 (97.1)	4.333	0.228
	Normal	319 (2.6)	11823 (97.4)
	Overweight	41 (2.0)	2059 (98.0)
	Obese	6 (1.7)	342 (98.3)
36 mo	Emaciation	2 (1.9)	102 (98.1)	1.888	0.596
	Normal	107 (2.2)	4663 (97.8)
	Overweight	18 (2.4)	729 (97.6)
	Obese	2 (0.9)	216 (99.1)

^aP < 0.05, statistically significant difference compared with super recombination.

^cP < 0.05, statistically significant difference compared to the normal group.