condition mean min max ZT0-3 13.9725 11.5961 16.3489 ZT4-7 8.35253 8.35253 8.35253 ZT8-11 11.288 11.288 11.288 ZT12-15 0 0 0 ZT16-19 13.8132 13.8132 13.8132 ZT20-23 12.181049999999999 12.181049999999999 12.181049999999999