condition mean min max ZT0-3 9.106248 9.106248 9.106248 ZT4-7 9.5994255 9.5994255 9.5994255 ZT8-11 11.675330500000001 11.675330500000001 11.675330500000001 ZT12-15 9.1935845 9.1935845 9.1935845 ZT16-19 9.975414 9.975414 9.975414 ZT20-23 10.5071565 10.5071565 10.5071565