condition mean min max ZT0-3 127.770518 127.770518 127.770518 ZT4-7 109.4403305 109.4403305 109.4403305 ZT8-11 95.3962225 95.3962225 95.3962225 ZT12-15 136.094898 136.094898 136.094898 ZT16-19 149.954484 149.954484 149.954484 ZT20-23 172.6925835 172.6925835 172.6925835