condition mean min max ZT0-3 945.028813 945.028813 945.028813 ZT4-7 684.3365160000001 684.3365160000001 684.3365160000001 ZT8-11 891.815906 891.815906 891.815906 ZT12-15 969.172557 969.172557 969.172557 ZT16-19 1492.598934 1492.598934 1492.598934 ZT20-23 1306.9762395 1306.9762395 1306.9762395