condition mean min max ZT0-3 268.667145 268.667145 268.667145 ZT4-7 425.3470955 425.3470955 425.3470955 ZT8-11 394.72137699999996 394.72137699999996 394.72137699999996 ZT12-15 469.69741799999997 469.69741799999997 469.69741799999997 ZT16-19 470.80870600000003 470.80870600000003 470.80870600000003 ZT20-23 446.3203545 446.3203545 446.3203545