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Table 2 Baseline socio-demographic characteristics and clinical variables

From: Effectiveness of a multidisciplinary BIOPSYCHOSOCIAL intervention for non-specific SUBACUTE low back pain in a working population: a cluster randomized clinical trial

 TotalControl groupIntervention group
No. of PHCC / No. of patients39/50126/23913/262
Socio-demographic characteristics:
 Age (years), mean (SD)46.8 (11.5)46.4 (11.1)47.2 (11.9)
 Sex (female), n (%)324 (64.7)145 (60.7)179 (68.3)
 Educational level, n (%) (n = 499)
  ▪ Illiterate or primary school only122 (24.4)61 (25.6)61 (23.4)
  ▪ Secondary school274 (54.9)134 (56.3)140 (53.6)
  ▪ University103 (20.6)43 (18.1)60 (23.0)
Paid job (yes), n (%)369 (73.7)188 (78.7)181 (69.1)
Clinical variables:
 Body mass index (kg/m2) classification (n = 500), mean (SD)
  ▪ Normal weight222 (44.4)105 (43.9)117 (44.8)
  ▪ Overweight195 (39.0)94 (39.3)101 (38.7)
  ▪ Obesity83 (16.6)40 (16.7)43 (16.5)
  1. Abbreviations: SD standard deviation, LBP Low Back Pain, PHCC Primary Health Care Centre. Data are mean (SD) or n(%)