condition mean min max ZT0-3 952.145963 952.145963 952.145963 ZT4-7 675.832484 675.832484 675.832484 ZT8-11 698.6008405 698.6008405 698.6008405 ZT12-15 889.8142845 889.8142845 889.8142845 ZT16-19 919.1317495000001 919.1317495000001 919.1317495000001 ZT20-23 1215.7722374999998 1215.7722374999998 1215.7722374999998