condition mean min max ZT0-3 223.134475 223.134475 223.134475 ZT4-7 192.4009075 192.4009075 192.4009075 ZT8-11 145.784674 145.784674 145.784674 ZT12-15 169.453893 169.453893 169.453893 ZT16-19 127.437444 127.437444 127.437444 ZT20-23 147.011628 147.011628 147.011628