Table 1.

Characteristics of the study population. Children born 2009–2016. Kaiser Permanente Northern California.

	Children with fever (7–10 days) after MCV N = 3750 n (%)	Children without fever (7–10 days) after MCV N = 240375 n (%)	p value
Child’s sex			0.001
Male	2022 (53.92)	122472 (50.95)
Female	1728 (46.08)	117903 (49.05)
Gestational age at birth			<0.001
<37 weeks (preterm)	340 (9.07)	17423 (7.25)
≥37 weeks	2934 (78.24)	191715 (79.76)
Missing gestational age	476 (12.69)	31240 (13.00)
>2 visits between ages 7–12 months	1994 (53.17)	88412 (36.78)	<0.001
Maternal race			<0.001
Asian	904 (24.11)	58584 (24.37)
Black	193 (5.15)	15371 (6.39)
Pacific Islander	26 (0.69)	1968 (0.82)
White	1298 (34.61)	93947 (39.08)
Multiracial	207 (5.52)	13211 (5.50)
Native American	19 (0.51)	979 (0.41)
Unknown	1103 (29.41)	56318 (23.43)
Maternal age at delivery (years)			0.007
<18	21 (0.56)	1400 (0.58)
18–25	474 (12.64)	27996 (11.65)
25–30	985 (26.27)	63009 (26.21)
30–35	1400 (37.33)	86173 (35.85)
35–40	672 (17.92)	48835 (20.32)
≥40	198 (5.28)	12965 (5.39)
Paternal race			<0.001
Asian	502 (13.39)	30692 (12.77)
Black	94 (2.51)	7531 (3.13)
Pacific Islander	16 (0.43)	1705 (0.71)
White	803 (21.41)	59817 (24.88)
Multiracial	49 (1.31)	3137 (1.31)
Native American	10 (0.27)	664 (0.28)
Unknown	709 (18.91)	38145 (15.87)
Missing paternal information	1567 (41.80)	98684 (41.10)
Paternal age at infant birth (years)			0.04
<18	2 (0.05)	41 (0.02)
18–25	80 (2.13)	4957 (2.06)
25–30	354 (9.44)	24647 (10.25)
30–35	794 (21.17)	48903 (20.34)
35–40	594 (15.84)	37028 (15.40)
≥40	359 (9.57)	26115 (10.86)
Missing paternal information	1567 (41.80)	98687 (41.10)

MCV = measles containing vaccine