TABLE 3

Sociodemographic and QoL Characteristics of Each of the Sleep Trajectories

Typical Sleepers (n = 1190)Poor Sleepers (n = 74)Initially Short Sleepers (n = 1323)Persistent Short Sleepers (n = 339)
Gender
 Female43.9 (522)45.9 (34)52.2 (691)79.9 (271)
 Male56.1 (668)54.1 (40)47.8 (632)20.1 (68)
Children with sleep problems16.8 (200)91.9 (68)*78.9 (1044)*64.0 (217)*
Sleep duration (hr:min), mean (SD)
 0–1 y14:34 (1:19)9:54 (1:14)*12:42 (1:22)*13:25 (1:32)*
 2–3 y12:10 (1:08)10:29 (1:05)*11:23 (1:11)*11:34 (1:10)*
 4–5 y11:15 (0:52)11:03 (0:59)11:02 (1:01)*10:55 (0:50)*
 6–7 y10:45 (0.34)10:32 (0:33)*10:37 (0.32)*9:44 (0:26)*
Child irritability2.03 (0.62)3.39 (0.90)*2.80 (0.74)*2.73 (0.75)*
Household size3.88 (0.98)5.41 (1.67)*3.81 (0.81)4.59 (1.44)
Household financial hardship0.49 (0.86)2.27 (1.62)*0.66 (1.05)1.29 (1.47)*
Maternal employment status
 Not employed45.2 (538)70.3 (52)38.0 (503)66.4 (225)
 Part-time work (1–34 h/week)47.0 (559)12.2 (9)42.6 (564)14.7 (50)
 Full-time work (≥35 h/week)7.8 (93)17.6 (13)*19.3 (256)18.9 (64)*
PedsQL scores at age 6–7 y
 Physical functioning, mean (SD)82.83 (15.93)73.93 (21.64)*80.10 (16.75)*77.79 (18.07)*
 Emotional functioning, mean (SD)77.52 (13.77)71.84 (18.69)73.81 (14.47)70.51 (17.47)*
 Social functioning, mean (SD)83.00 (15.58)76.58 (18.08)81.43 (16.32)77.94 (18.80)*
  • Data presented as frequencies (percentages) unless specified otherwise. Percentages do not sum to 100.0% on variables where there are missing data. *Indicates a significant difference (P < .05) relative to typical sleepers.