condition mean min max ZT0-3 15.39855 15.39855 15.39855 ZT4-7 9.820129999999999 9.820129999999999 9.820129999999999 ZT8-11 11.251100000000001 11.251100000000001 11.251100000000001 ZT12-15 11.30835 11.30835 11.30835 ZT16-19 27.6059 27.6059 27.6059 ZT20-23 19.7607 19.7607 19.7607