condition mean min max ZT0-3 13.310731 13.310731 13.310731 ZT4-7 12.4169995 12.4169995 12.4169995 ZT8-11 11.7479035 11.7479035 11.7479035 ZT12-15 11.329219 11.329219 11.329219 ZT16-19 10.5492195 10.5492195 10.5492195 ZT20-23 12.9838845 12.9838845 12.9838845