condition mean min max ZT0-3 217.313196 217.313196 217.313196 ZT4-7 176.76397350000002 176.76397350000002 176.76397350000002 ZT8-11 179.212443 179.212443 179.212443 ZT12-15 192.07887399999998 192.07887399999998 192.07887399999998 ZT16-19 230.158753 230.158753 230.158753 ZT20-23 269.7588645 269.7588645 269.7588645