condition mean min max ZT0-3 13.908268 13.908268 13.908268 ZT4-7 13.9008655 13.9008655 13.9008655 ZT8-11 13.0202045 13.0202045 13.0202045 ZT12-15 13.346279 13.346279 13.346279 ZT16-19 12.673659 12.673659 12.673659 ZT20-23 11.3120425 11.3120425 11.3120425