condition mean min max ZT0-3 242.84966666666668 228.7745 262.285 ZT4-7 238.19 238.19 238.19 ZT8-11 264.336 264.336 264.336 ZT12-15 247.447 231.81849999999997 263.07550000000003 ZT16-19 265.7715 265.7715 265.7715 ZT20-23 220.196 220.196 220.196