condition mean min max ZT0-3 66.787204 66.787204 66.787204 ZT4-7 66.6619905 66.6619905 66.6619905 ZT8-11 65.752276 65.752276 65.752276 ZT12-15 77.7008075 77.7008075 77.7008075 ZT16-19 63.951271 63.951271 63.951271 ZT20-23 61.693953 61.693953 61.693953