condition mean min max ZT0-3 503.5 503.5 503.5 ZT4-7 316.2 316.2 316.2 ZT8-11 421.85 421.85 421.85 ZT12-15 633.3 633.3 633.3 ZT16-19 659.3499999999999 659.3499999999999 659.3499999999999 ZT20-23 545.1 545.1 545.1