condition mean min max ZT0-3 11.348481666666666 8.255545 13.24775 ZT4-7 10.1308 10.1308 10.1308 ZT8-11 8.958835 8.958835 8.958835 ZT12-15 13.712275 12.5308 14.89375 ZT16-19 12.30475 12.30475 12.30475 ZT20-23 17.21565 17.21565 17.21565