condition mean min max ZT0-3 14.932456 14.932456 14.932456 ZT4-7 14.101097 14.101097 14.101097 ZT8-11 15.33992 15.33992 15.33992 ZT12-15 13.3094245 13.3094245 13.3094245 ZT16-19 13.4319025 13.4319025 13.4319025 ZT20-23 15.814613999999999 15.814613999999999 15.814613999999999