condition mean min max ZT0-3 17.914218 17.914218 17.914218 ZT4-7 20.087514499999997 20.087514499999997 20.087514499999997 ZT8-11 48.1595995 48.1595995 48.1595995 ZT12-15 19.888239 19.888239 19.888239 ZT16-19 24.083737 24.083737 24.083737 ZT20-23 102.9183275 102.9183275 102.9183275