condition mean min max ZT0-3 12.685265 12.685265 12.685265 ZT4-7 11.947138500000001 11.947138500000001 11.947138500000001 ZT8-11 14.319577500000001 14.319577500000001 14.319577500000001 ZT12-15 11.192566 11.192566 11.192566 ZT16-19 9.8613665 9.8613665 9.8613665 ZT20-23 12.318454500000001 12.318454500000001 12.318454500000001