Table I.

Chi² values for the distribution of drones and workers of 4 different age classes on open and sealed brood, and non-brood areas (Fig. 2). Upper right half of tables: brood vs. non-brood, lower left half of the tables: open brood vs. sealed brood (*, threshold = 6.960 for P < 0.05 and **, threshold = 9.885 for P < 0.01; df = 6; N: drones = 20–898; workers = 46–798).

Drones	0–2 d	3–7 d	8–12 d	≥ 13 d
0–2 d	x	8.45*	6.32	88.77**
3–7 d	38.6**	x	47.21**	231.7**
8–12 d	0.82	36.4**	x	57.04**
≥ 13 d	0.59	21.8**	0.00	x
Workers	0–2 d	3–7 d	8–12 d	≥ 13 d
0–2 d	x	8.78*	28.40**	132.15**
3–7 d	2.44	x	11.53**	143.63**
8–12 d	1.43	0.06	x	46.95**
≥ 13 d	3.19	0.06	0.22	x