condition mean min max ZT0-3 380.858308 380.858308 380.858308 ZT4-7 441.4992035 441.4992035 441.4992035 ZT8-11 503.11076649999995 503.11076649999995 503.11076649999995 ZT12-15 560.680451 560.680451 560.680451 ZT16-19 515.2067415 515.2067415 515.2067415 ZT20-23 424.338393 424.338393 424.338393