condition mean min max ZT0-3 623.561359 623.561359 623.561359 ZT4-7 405.8078435 405.8078435 405.8078435 ZT8-11 590.937224 590.937224 590.937224 ZT12-15 639.0667805 639.0667805 639.0667805 ZT16-19 1040.188727 1040.188727 1040.188727 ZT20-23 1078.4039435 1078.4039435 1078.4039435