condition mean min max ZT0-3 14.431006 14.431006 14.431006 ZT4-7 16.485987 16.485987 16.485987 ZT8-11 14.5350965 14.5350965 14.5350965 ZT12-15 14.844162 14.844162 14.844162 ZT16-19 14.7042395 14.7042395 14.7042395 ZT20-23 14.540327 14.540327 14.540327