condition mean min max ZT0-3 10.635826 10.635826 10.635826 ZT4-7 11.984574 11.984574 11.984574 ZT8-11 10.614914500000001 10.614914500000001 10.614914500000001 ZT12-15 11.508140000000001 11.508140000000001 11.508140000000001 ZT16-19 10.4019025 10.4019025 10.4019025 ZT20-23 11.3261205 11.3261205 11.3261205